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-rw-r--r--arch/powerpc/lib/Makefile4
-rw-r--r--arch/powerpc/lib/code-patching.c448
-rw-r--r--arch/powerpc/lib/dma-noncoherent.c11
-rw-r--r--arch/powerpc/lib/feature-fixups-test.S742
-rw-r--r--arch/powerpc/lib/feature-fixups.c351
5 files changed, 1554 insertions, 2 deletions
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index e522b06cc42..2a88e8b9a3c 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -24,3 +24,7 @@ obj-$(CONFIG_SMP) += locks.o
endif
obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
+
+obj-y += code-patching.o
+obj-y += feature-fixups.o
+obj-$(CONFIG_FTR_FIXUP_SELFTEST) += feature-fixups-test.o
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
new file mode 100644
index 00000000000..0559fe086eb
--- /dev/null
+++ b/arch/powerpc/lib/code-patching.c
@@ -0,0 +1,448 @@
+/*
+ * Copyright 2008 Michael Ellerman, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <asm/page.h>
+#include <asm/code-patching.h>
+
+
+void patch_instruction(unsigned int *addr, unsigned int instr)
+{
+ *addr = instr;
+ asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (addr));
+}
+
+void patch_branch(unsigned int *addr, unsigned long target, int flags)
+{
+ patch_instruction(addr, create_branch(addr, target, flags));
+}
+
+unsigned int create_branch(const unsigned int *addr,
+ unsigned long target, int flags)
+{
+ unsigned int instruction;
+ long offset;
+
+ offset = target;
+ if (! (flags & BRANCH_ABSOLUTE))
+ offset = offset - (unsigned long)addr;
+
+ /* Check we can represent the target in the instruction format */
+ if (offset < -0x2000000 || offset > 0x1fffffc || offset & 0x3)
+ return 0;
+
+ /* Mask out the flags and target, so they don't step on each other. */
+ instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC);
+
+ return instruction;
+}
+
+unsigned int create_cond_branch(const unsigned int *addr,
+ unsigned long target, int flags)
+{
+ unsigned int instruction;
+ long offset;
+
+ offset = target;
+ if (! (flags & BRANCH_ABSOLUTE))
+ offset = offset - (unsigned long)addr;
+
+ /* Check we can represent the target in the instruction format */
+ if (offset < -0x8000 || offset > 0x7FFF || offset & 0x3)
+ return 0;
+
+ /* Mask out the flags and target, so they don't step on each other. */
+ instruction = 0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC);
+
+ return instruction;
+}
+
+static unsigned int branch_opcode(unsigned int instr)
+{
+ return (instr >> 26) & 0x3F;
+}
+
+static int instr_is_branch_iform(unsigned int instr)
+{
+ return branch_opcode(instr) == 18;
+}
+
+static int instr_is_branch_bform(unsigned int instr)
+{
+ return branch_opcode(instr) == 16;
+}
+
+int instr_is_relative_branch(unsigned int instr)
+{
+ if (instr & BRANCH_ABSOLUTE)
+ return 0;
+
+ return instr_is_branch_iform(instr) || instr_is_branch_bform(instr);
+}
+
+static unsigned long branch_iform_target(const unsigned int *instr)
+{
+ signed long imm;
+
+ imm = *instr & 0x3FFFFFC;
+
+ /* If the top bit of the immediate value is set this is negative */
+ if (imm & 0x2000000)
+ imm -= 0x4000000;
+
+ if ((*instr & BRANCH_ABSOLUTE) == 0)
+ imm += (unsigned long)instr;
+
+ return (unsigned long)imm;
+}
+
+static unsigned long branch_bform_target(const unsigned int *instr)
+{
+ signed long imm;
+
+ imm = *instr & 0xFFFC;
+
+ /* If the top bit of the immediate value is set this is negative */
+ if (imm & 0x8000)
+ imm -= 0x10000;
+
+ if ((*instr & BRANCH_ABSOLUTE) == 0)
+ imm += (unsigned long)instr;
+
+ return (unsigned long)imm;
+}
+
+unsigned long branch_target(const unsigned int *instr)
+{
+ if (instr_is_branch_iform(*instr))
+ return branch_iform_target(instr);
+ else if (instr_is_branch_bform(*instr))
+ return branch_bform_target(instr);
+
+ return 0;
+}
+
+int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr)
+{
+ if (instr_is_branch_iform(*instr) || instr_is_branch_bform(*instr))
+ return branch_target(instr) == addr;
+
+ return 0;
+}
+
+unsigned int translate_branch(const unsigned int *dest, const unsigned int *src)
+{
+ unsigned long target;
+
+ target = branch_target(src);
+
+ if (instr_is_branch_iform(*src))
+ return create_branch(dest, target, *src);
+ else if (instr_is_branch_bform(*src))
+ return create_cond_branch(dest, target, *src);
+
+ return 0;
+}
+
+
+#ifdef CONFIG_CODE_PATCHING_SELFTEST
+
+static void __init test_trampoline(void)
+{
+ asm ("nop;\n");
+}
+
+#define check(x) \
+ if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__);
+
+static void __init test_branch_iform(void)
+{
+ unsigned int instr;
+ unsigned long addr;
+
+ addr = (unsigned long)&instr;
+
+ /* The simplest case, branch to self, no flags */
+ check(instr_is_branch_iform(0x48000000));
+ /* All bits of target set, and flags */
+ check(instr_is_branch_iform(0x4bffffff));
+ /* High bit of opcode set, which is wrong */
+ check(!instr_is_branch_iform(0xcbffffff));
+ /* Middle bits of opcode set, which is wrong */
+ check(!instr_is_branch_iform(0x7bffffff));
+
+ /* Simplest case, branch to self with link */
+ check(instr_is_branch_iform(0x48000001));
+ /* All bits of targets set */
+ check(instr_is_branch_iform(0x4bfffffd));
+ /* Some bits of targets set */
+ check(instr_is_branch_iform(0x4bff00fd));
+ /* Must be a valid branch to start with */
+ check(!instr_is_branch_iform(0x7bfffffd));
+
+ /* Absolute branch to 0x100 */
+ instr = 0x48000103;
+ check(instr_is_branch_to_addr(&instr, 0x100));
+ /* Absolute branch to 0x420fc */
+ instr = 0x480420ff;
+ check(instr_is_branch_to_addr(&instr, 0x420fc));
+ /* Maximum positive relative branch, + 20MB - 4B */
+ instr = 0x49fffffc;
+ check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC));
+ /* Smallest negative relative branch, - 4B */
+ instr = 0x4bfffffc;
+ check(instr_is_branch_to_addr(&instr, addr - 4));
+ /* Largest negative relative branch, - 32 MB */
+ instr = 0x4a000000;
+ check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
+
+ /* Branch to self, with link */
+ instr = create_branch(&instr, addr, BRANCH_SET_LINK);
+ check(instr_is_branch_to_addr(&instr, addr));
+
+ /* Branch to self - 0x100, with link */
+ instr = create_branch(&instr, addr - 0x100, BRANCH_SET_LINK);
+ check(instr_is_branch_to_addr(&instr, addr - 0x100));
+
+ /* Branch to self + 0x100, no link */
+ instr = create_branch(&instr, addr + 0x100, 0);
+ check(instr_is_branch_to_addr(&instr, addr + 0x100));
+
+ /* Maximum relative negative offset, - 32 MB */
+ instr = create_branch(&instr, addr - 0x2000000, BRANCH_SET_LINK);
+ check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
+
+ /* Out of range relative negative offset, - 32 MB + 4*/
+ instr = create_branch(&instr, addr - 0x2000004, BRANCH_SET_LINK);
+ check(instr == 0);
+
+ /* Out of range relative positive offset, + 32 MB */
+ instr = create_branch(&instr, addr + 0x2000000, BRANCH_SET_LINK);
+ check(instr == 0);
+
+ /* Unaligned target */
+ instr = create_branch(&instr, addr + 3, BRANCH_SET_LINK);
+ check(instr == 0);
+
+ /* Check flags are masked correctly */
+ instr = create_branch(&instr, addr, 0xFFFFFFFC);
+ check(instr_is_branch_to_addr(&instr, addr));
+ check(instr == 0x48000000);
+}
+
+static void __init test_create_function_call(void)
+{
+ unsigned int *iptr;
+ unsigned long dest;
+
+ /* Check we can create a function call */
+ iptr = (unsigned int *)ppc_function_entry(test_trampoline);
+ dest = ppc_function_entry(test_create_function_call);
+ patch_instruction(iptr, create_branch(iptr, dest, BRANCH_SET_LINK));
+ check(instr_is_branch_to_addr(iptr, dest));
+}
+
+static void __init test_branch_bform(void)
+{
+ unsigned long addr;
+ unsigned int *iptr, instr, flags;
+
+ iptr = &instr;
+ addr = (unsigned long)iptr;
+
+ /* The simplest case, branch to self, no flags */
+ check(instr_is_branch_bform(0x40000000));
+ /* All bits of target set, and flags */
+ check(instr_is_branch_bform(0x43ffffff));
+ /* High bit of opcode set, which is wrong */
+ check(!instr_is_branch_bform(0xc3ffffff));
+ /* Middle bits of opcode set, which is wrong */
+ check(!instr_is_branch_bform(0x7bffffff));
+
+ /* Absolute conditional branch to 0x100 */
+ instr = 0x43ff0103;
+ check(instr_is_branch_to_addr(&instr, 0x100));
+ /* Absolute conditional branch to 0x20fc */
+ instr = 0x43ff20ff;
+ check(instr_is_branch_to_addr(&instr, 0x20fc));
+ /* Maximum positive relative conditional branch, + 32 KB - 4B */
+ instr = 0x43ff7ffc;
+ check(instr_is_branch_to_addr(&instr, addr + 0x7FFC));
+ /* Smallest negative relative conditional branch, - 4B */
+ instr = 0x43fffffc;
+ check(instr_is_branch_to_addr(&instr, addr - 4));
+ /* Largest negative relative conditional branch, - 32 KB */
+ instr = 0x43ff8000;
+ check(instr_is_branch_to_addr(&instr, addr - 0x8000));
+
+ /* All condition code bits set & link */
+ flags = 0x3ff000 | BRANCH_SET_LINK;
+
+ /* Branch to self */
+ instr = create_cond_branch(iptr, addr, flags);
+ check(instr_is_branch_to_addr(&instr, addr));
+
+ /* Branch to self - 0x100 */
+ instr = create_cond_branch(iptr, addr - 0x100, flags);
+ check(instr_is_branch_to_addr(&instr, addr - 0x100));
+
+ /* Branch to self + 0x100 */
+ instr = create_cond_branch(iptr, addr + 0x100, flags);
+ check(instr_is_branch_to_addr(&instr, addr + 0x100));
+
+ /* Maximum relative negative offset, - 32 KB */
+ instr = create_cond_branch(iptr, addr - 0x8000, flags);
+ check(instr_is_branch_to_addr(&instr, addr - 0x8000));
+
+ /* Out of range relative negative offset, - 32 KB + 4*/
+ instr = create_cond_branch(iptr, addr - 0x8004, flags);
+ check(instr == 0);
+
+ /* Out of range relative positive offset, + 32 KB */
+ instr = create_cond_branch(iptr, addr + 0x8000, flags);
+ check(instr == 0);
+
+ /* Unaligned target */
+ instr = create_cond_branch(iptr, addr + 3, flags);
+ check(instr == 0);
+
+ /* Check flags are masked correctly */
+ instr = create_cond_branch(iptr, addr, 0xFFFFFFFC);
+ check(instr_is_branch_to_addr(&instr, addr));
+ check(instr == 0x43FF0000);
+}
+
+static void __init test_translate_branch(void)
+{
+ unsigned long addr;
+ unsigned int *p, *q;
+ void *buf;
+
+ buf = vmalloc(PAGE_ALIGN(0x2000000 + 1));
+ check(buf);
+ if (!buf)
+ return;
+
+ /* Simple case, branch to self moved a little */
+ p = buf;
+ addr = (unsigned long)p;
+ patch_branch(p, addr, 0);
+ check(instr_is_branch_to_addr(p, addr));
+ q = p + 1;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(q, addr));
+
+ /* Maximum negative case, move b . to addr + 32 MB */
+ p = buf;
+ addr = (unsigned long)p;
+ patch_branch(p, addr, 0);
+ q = buf + 0x2000000;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+ check(*q == 0x4a000000);
+
+ /* Maximum positive case, move x to x - 32 MB + 4 */
+ p = buf + 0x2000000;
+ addr = (unsigned long)p;
+ patch_branch(p, addr, 0);
+ q = buf + 4;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+ check(*q == 0x49fffffc);
+
+ /* Jump to x + 16 MB moved to x + 20 MB */
+ p = buf;
+ addr = 0x1000000 + (unsigned long)buf;
+ patch_branch(p, addr, BRANCH_SET_LINK);
+ q = buf + 0x1400000;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+
+ /* Jump to x + 16 MB moved to x - 16 MB + 4 */
+ p = buf + 0x1000000;
+ addr = 0x2000000 + (unsigned long)buf;
+ patch_branch(p, addr, 0);
+ q = buf + 4;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+
+
+ /* Conditional branch tests */
+
+ /* Simple case, branch to self moved a little */
+ p = buf;
+ addr = (unsigned long)p;
+ patch_instruction(p, create_cond_branch(p, addr, 0));
+ check(instr_is_branch_to_addr(p, addr));
+ q = p + 1;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(q, addr));
+
+ /* Maximum negative case, move b . to addr + 32 KB */
+ p = buf;
+ addr = (unsigned long)p;
+ patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
+ q = buf + 0x8000;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+ check(*q == 0x43ff8000);
+
+ /* Maximum positive case, move x to x - 32 KB + 4 */
+ p = buf + 0x8000;
+ addr = (unsigned long)p;
+ patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
+ q = buf + 4;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+ check(*q == 0x43ff7ffc);
+
+ /* Jump to x + 12 KB moved to x + 20 KB */
+ p = buf;
+ addr = 0x3000 + (unsigned long)buf;
+ patch_instruction(p, create_cond_branch(p, addr, BRANCH_SET_LINK));
+ q = buf + 0x5000;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+
+ /* Jump to x + 8 KB moved to x - 8 KB + 4 */
+ p = buf + 0x2000;
+ addr = 0x4000 + (unsigned long)buf;
+ patch_instruction(p, create_cond_branch(p, addr, 0));
+ q = buf + 4;
+ patch_instruction(q, translate_branch(q, p));
+ check(instr_is_branch_to_addr(p, addr));
+ check(instr_is_branch_to_addr(q, addr));
+
+ /* Free the buffer we were using */
+ vfree(buf);
+}
+
+static int __init test_code_patching(void)
+{
+ printk(KERN_DEBUG "Running code patching self-tests ...\n");
+
+ test_branch_iform();
+ test_branch_bform();
+ test_create_function_call();
+ test_translate_branch();
+
+ return 0;
+}
+late_initcall(test_code_patching);
+
+#endif /* CONFIG_CODE_PATCHING_SELFTEST */
diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c
index 6656d47841d..5d83907f659 100644
--- a/arch/powerpc/lib/dma-noncoherent.c
+++ b/arch/powerpc/lib/dma-noncoherent.c
@@ -348,8 +348,15 @@ void __dma_sync(void *vaddr, size_t size, int direction)
switch (direction) {
case DMA_NONE:
BUG();
- case DMA_FROM_DEVICE: /* invalidate only */
- invalidate_dcache_range(start, end);
+ case DMA_FROM_DEVICE:
+ /*
+ * invalidate only when cache-line aligned otherwise there is
+ * the potential for discarding uncommitted data from the cache
+ */
+ if ((start & (L1_CACHE_BYTES - 1)) || (size & (L1_CACHE_BYTES - 1)))
+ flush_dcache_range(start, end);
+ else
+ invalidate_dcache_range(start, end);
break;
case DMA_TO_DEVICE: /* writeback only */
clean_dcache_range(start, end);
diff --git a/arch/powerpc/lib/feature-fixups-test.S b/arch/powerpc/lib/feature-fixups-test.S
new file mode 100644
index 00000000000..cb737484c5a
--- /dev/null
+++ b/arch/powerpc/lib/feature-fixups-test.S
@@ -0,0 +1,742 @@
+/*
+ * Copyright 2008 Michael Ellerman, IBM Corporation.
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/feature-fixups.h>
+#include <asm/ppc_asm.h>
+#include <asm/synch.h>
+
+ .text
+
+#define globl(x) \
+ .globl x; \
+x:
+
+globl(ftr_fixup_test1)
+ or 1,1,1
+ or 2,2,2 /* fixup will nop out this instruction */
+ or 3,3,3
+
+globl(end_ftr_fixup_test1)
+
+globl(ftr_fixup_test1_orig)
+ or 1,1,1
+ or 2,2,2
+ or 3,3,3
+
+globl(ftr_fixup_test1_expected)
+ or 1,1,1
+ nop
+ or 3,3,3
+
+globl(ftr_fixup_test2)
+ or 1,1,1
+ or 2,2,2 /* fixup will replace this with ftr_fixup_test2_alt */
+ or 3,3,3
+
+globl(end_ftr_fixup_test2)
+
+globl(ftr_fixup_test2_orig)
+ or 1,1,1
+ or 2,2,2
+ or 3,3,3
+
+globl(ftr_fixup_test2_alt)
+ or 31,31,31
+
+globl(ftr_fixup_test2_expected)
+ or 1,1,1
+ or 31,31,31
+ or 3,3,3
+
+globl(ftr_fixup_test3)
+ or 1,1,1
+ or 2,2,2 /* fixup will fail to replace this */
+ or 3,3,3
+
+globl(end_ftr_fixup_test3)
+
+globl(ftr_fixup_test3_orig)
+ or 1,1,1
+ or 2,2,2
+ or 3,3,3
+
+globl(ftr_fixup_test3_alt)
+ or 31,31,31
+ or 31,31,31
+
+globl(ftr_fixup_test4)
+ or 1,1,1
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 3,3,3
+
+globl(end_ftr_fixup_test4)
+
+globl(ftr_fixup_test4_expected)
+ or 1,1,1
+ or 31,31,31
+ or 31,31,31
+ nop
+ nop
+ or 3,3,3
+
+globl(ftr_fixup_test4_orig)
+ or 1,1,1
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 3,3,3
+
+globl(ftr_fixup_test4_alt)
+ or 31,31,31
+ or 31,31,31
+
+
+globl(ftr_fixup_test5)
+ or 1,1,1
+BEGIN_FTR_SECTION
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+FTR_SECTION_ELSE
+2: b 3f
+3: or 5,5,5
+ beq 3b
+ b 1f
+ or 6,6,6
+ b 2b
+1: bdnz 3b
+ALT_FTR_SECTION_END(0, 1)
+ or 1,1,1
+
+globl(end_ftr_fixup_test5)
+
+globl(ftr_fixup_test5_expected)
+ or 1,1,1
+2: b 3f
+3: or 5,5,5
+ beq 3b
+ b 1f
+ or 6,6,6
+ b 2b
+1: bdnz 3b
+ or 1,1,1
+
+globl(ftr_fixup_test6)
+1: or 1,1,1
+BEGIN_FTR_SECTION
+ or 5,5,5
+2: PPC_LCMPI r3,0
+ beq 4f
+ blt 2b
+ b 1b
+ b 4f
+FTR_SECTION_ELSE
+2: or 2,2,2
+ PPC_LCMPI r3,1
+ beq 3f
+ blt 2b
+ b 3f
+ b 1b
+ALT_FTR_SECTION_END(0, 1)
+3: or 1,1,1
+ or 2,2,2
+4: or 3,3,3
+
+globl(end_ftr_fixup_test6)
+
+globl(ftr_fixup_test6_expected)
+1: or 1,1,1
+2: or 2,2,2
+ PPC_LCMPI r3,1
+ beq 3f
+ blt 2b
+ b 3f
+ b 1b
+2: or 1,1,1
+ or 2,2,2
+3: or 3,3,3
+
+
+#define MAKE_MACRO_TEST(TYPE) \
+globl(ftr_fixup_test_ ##TYPE##_macros) \
+ or 1,1,1; \
+ /* Basic test, this section should all be nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic test, this section should NOT be nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, inner section should be nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(80) \
+ or 3,3,3; \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 1, 80) \
+ or 2,2,2; \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, whole section should be nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(80) \
+ or 3,3,3; \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 0, 80) \
+ or 2,2,2; \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, none should be nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(80) \
+ or 3,3,3; \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 0, 80) \
+ or 2,2,2; \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic alt section test, default case should be taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 5,5,5; \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic alt section test, else case should be taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+ or 31,31,31; \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt with smaller else case, should be padded with nops */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in default case */ \
+ /* Default case should be taken, with nop'ed inner section */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 3,3,3; \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 1, 95) \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 2,2,2; \
+ or 2,2,2; \
+ALT_##TYPE##_SECTION_END(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in else, default taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 5,5,5; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 1, 95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in else, else taken & nop */ \
+BEGIN_##TYPE##_SECTION \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+##TYPE##_SECTION_ELSE \
+ or 5,5,5; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 3,3,3; \
+END_##TYPE##_SECTION_NESTED(0, 1, 95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, default taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, else taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, all nop'ed */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) \
+ or 2,2,2; \
+END_##TYPE##_SECTION(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, default with inner default taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) \
+ or 2,2,2; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+BEGIN_##TYPE##_SECTION_NESTED(94) \
+ or 5,5,5; \
+##TYPE##_SECTION_ELSE_NESTED(94) \
+ or 1,1,1; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, default with inner else taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) \
+ or 2,2,2; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+BEGIN_##TYPE##_SECTION_NESTED(94) \
+ or 5,5,5; \
+##TYPE##_SECTION_ELSE_NESTED(94) \
+ or 1,1,1; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 0) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else with inner default taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) \
+ or 2,2,2; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+BEGIN_##TYPE##_SECTION_NESTED(94) \
+ or 5,5,5; \
+##TYPE##_SECTION_ELSE_NESTED(94) \
+ or 1,1,1; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else with inner else taken */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+BEGIN_##TYPE##_SECTION_NESTED(95) \
+ or 1,1,1; \
+##TYPE##_SECTION_ELSE_NESTED(95) \
+ or 5,5,5; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) \
+ or 2,2,2; \
+##TYPE##_SECTION_ELSE \
+ or 31,31,31; \
+BEGIN_##TYPE##_SECTION_NESTED(94) \
+ or 5,5,5; \
+##TYPE##_SECTION_ELSE_NESTED(94) \
+ or 1,1,1; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 94) \
+ or 31,31,31; \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else can have large else case */ \
+BEGIN_##TYPE##_SECTION \
+ or 2,2,2; \
+ or 2,2,2; \
+ or 2,2,2; \
+ or 2,2,2; \
+##TYPE##_SECTION_ELSE \
+BEGIN_##TYPE##_SECTION_NESTED(94) \
+ or 5,5,5; \
+ or 5,5,5; \
+ or 5,5,5; \
+ or 5,5,5; \
+##TYPE##_SECTION_ELSE_NESTED(94) \
+ or 1,1,1; \
+ or 1,1,1; \
+ or 1,1,1; \
+ or 1,1,1; \
+ALT_##TYPE##_SECTION_END_NESTED(0, 1, 94) \
+ALT_##TYPE##_SECTION_END(0, 1) \
+ or 1,1,1; \
+ or 1,1,1;
+
+#define MAKE_MACRO_TEST_EXPECTED(TYPE) \
+globl(ftr_fixup_test_ ##TYPE##_macros_expected) \
+ or 1,1,1; \
+ /* Basic test, this section should all be nop'ed */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ nop; \
+ nop; \
+ nop; \
+/* END_##TYPE##_SECTION(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic test, this section should NOT be nop'ed */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+ or 2,2,2; \
+ or 2,2,2; \
+/* END_##TYPE##_SECTION(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, inner section should be nop'ed */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(80) */ \
+ nop; \
+ nop; \
+/* END_##TYPE##_SECTION_NESTED(0, 1, 80) */ \
+ or 2,2,2; \
+ or 2,2,2; \
+/* END_##TYPE##_SECTION(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, whole section should be nop'ed */ \
+ /* NB. inner section is not nop'ed, but then entire outer is */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ nop; \
+ nop; \
+/* BEGIN_##TYPE##_SECTION_NESTED(80) */ \
+ nop; \
+ nop; \
+/* END_##TYPE##_SECTION_NESTED(0, 0, 80) */ \
+ nop; \
+ nop; \
+/* END_##TYPE##_SECTION(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nesting test, none should be nop'ed */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(80) */ \
+ or 3,3,3; \
+ or 3,3,3; \
+/* END_##TYPE##_SECTION_NESTED(0, 0, 80) */ \
+ or 2,2,2; \
+ or 2,2,2; \
+/* END_##TYPE##_SECTION(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic alt section test, default case should be taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+/* ##TYPE##_SECTION_ELSE */ \
+ /* or 5,5,5; */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Basic alt section test, else case should be taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+ or 31,31,31; \
+ or 31,31,31; \
+ or 31,31,31; \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt with smaller else case, should be padded with nops */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+ or 31,31,31; \
+ nop; \
+ nop; \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in default case */ \
+ /* Default case should be taken, with nop'ed inner section */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 3,3,3; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ nop; \
+ nop; \
+/* END_##TYPE##_SECTION_NESTED(0, 1, 95) */ \
+ or 3,3,3; \
+/* ##TYPE##_SECTION_ELSE */ \
+ /* or 2,2,2; */ \
+ /* or 2,2,2; */ \
+/* ALT_##TYPE##_SECTION_END(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in else, default taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 3,3,3; \
+ or 3,3,3; \
+ or 3,3,3; \
+/* ##TYPE##_SECTION_ELSE */ \
+ /* or 5,5,5; */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ /* or 3,3,3; */ \
+/* END_##TYPE##_SECTION_NESTED(0, 1, 95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Alt section with nested section in else, else taken & nop */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+ /* or 3,3,3; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+ or 5,5,5; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ nop; \
+/* END_##TYPE##_SECTION_NESTED(0, 1, 95) */ \
+ or 5,5,5; \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, default taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ or 1,1,1; \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) */ \
+ or 2,2,2; \
+/* END_##TYPE##_SECTION(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, else taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ /* or 1,1,1; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ or 5,5,5; \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) */ \
+ or 2,2,2; \
+/* END_##TYPE##_SECTION(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Feature section with nested alt section, all nop'ed */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ nop; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ nop; \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) */ \
+ nop; \
+/* END_##TYPE##_SECTION(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, default with inner default taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ or 1,1,1; \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 95) */ \
+ or 2,2,2; \
+/* ##TYPE##_SECTION_ELSE */ \
+ /* or 31,31,31; */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(94) */ \
+ /* or 5,5,5; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(94) */ \
+ /* or 1,1,1; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) */ \
+ /* or 31,31,31; */ \
+/* ALT_##TYPE##_SECTION_END(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, default with inner else taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ or 2,2,2; \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ /* or 1,1,1; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ or 5,5,5; \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) */ \
+ or 2,2,2; \
+/* ##TYPE##_SECTION_ELSE */ \
+ /* or 31,31,31; */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(94) */ \
+ /* or 5,5,5; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(94) */ \
+ /* or 1,1,1; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) */ \
+ /* or 31,31,31; */ \
+/* ALT_##TYPE##_SECTION_END(0, 0) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else with inner default taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 2,2,2; */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ /* or 1,1,1; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) */ \
+ /* or 2,2,2; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+ or 31,31,31; \
+/* BEGIN_##TYPE##_SECTION_NESTED(94) */ \
+ or 5,5,5; \
+/* ##TYPE##_SECTION_ELSE_NESTED(94) */ \
+ /* or 1,1,1; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 0, 94) */ \
+ or 31,31,31; \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else with inner else taken */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 2,2,2; */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(95) */ \
+ /* or 1,1,1; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(95) */ \
+ /* or 5,5,5; */ \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 95) */ \
+ /* or 2,2,2; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+ or 31,31,31; \
+/* BEGIN_##TYPE##_SECTION_NESTED(94) */ \
+ /* or 5,5,5; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(94) */ \
+ or 1,1,1; \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 94) */ \
+ or 31,31,31; \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ /* Nested alt sections, else can have large else case */ \
+/* BEGIN_##TYPE##_SECTION */ \
+ /* or 2,2,2; */ \
+ /* or 2,2,2; */ \
+ /* or 2,2,2; */ \
+ /* or 2,2,2; */ \
+/* ##TYPE##_SECTION_ELSE */ \
+/* BEGIN_##TYPE##_SECTION_NESTED(94) */ \
+ /* or 5,5,5; */ \
+ /* or 5,5,5; */ \
+ /* or 5,5,5; */ \
+ /* or 5,5,5; */ \
+/* ##TYPE##_SECTION_ELSE_NESTED(94) */ \
+ or 1,1,1; \
+ or 1,1,1; \
+ or 1,1,1; \
+ or 1,1,1; \
+/* ALT_##TYPE##_SECTION_END_NESTED(0, 1, 94) */ \
+/* ALT_##TYPE##_SECTION_END(0, 1) */ \
+ or 1,1,1; \
+ or 1,1,1;
+
+MAKE_MACRO_TEST(FTR);
+MAKE_MACRO_TEST_EXPECTED(FTR);
+
+#ifdef CONFIG_PPC64
+MAKE_MACRO_TEST(FW_FTR);
+MAKE_MACRO_TEST_EXPECTED(FW_FTR);
+#endif
+
+globl(lwsync_fixup_test)
+1: or 1,1,1
+ LWSYNC
+globl(end_lwsync_fixup_test)
+
+globl(lwsync_fixup_test_expected_LWSYNC)
+1: or 1,1,1
+ lwsync
+
+globl(lwsync_fixup_test_expected_SYNC)
+1: or 1,1,1
+ sync
+
diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
new file mode 100644
index 00000000000..4e43702b981
--- /dev/null
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
+ *
+ * Modifications for ppc64:
+ * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
+ *
+ * Copyright 2008 Michael Ellerman, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <asm/cputable.h>
+#include <asm/code-patching.h>
+
+
+struct fixup_entry {
+ unsigned long mask;
+ unsigned long value;
+ long start_off;
+ long end_off;
+ long alt_start_off;
+ long alt_end_off;
+};
+
+static unsigned int *calc_addr(struct fixup_entry *fcur, long offset)
+{
+ /*
+ * We store the offset to the code as a negative offset from
+ * the start of the alt_entry, to support the VDSO. This
+ * routine converts that back into an actual address.
+ */
+ return (unsigned int *)((unsigned long)fcur + offset);
+}
+
+static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
+ unsigned int *alt_start, unsigned int *alt_end)
+{
+ unsigned int instr;
+
+ instr = *src;
+
+ if (instr_is_relative_branch(*src)) {
+ unsigned int *target = (unsigned int *)branch_target(src);
+
+ /* Branch within the section doesn't need translating */
+ if (target < alt_start || target >= alt_end) {
+ instr = translate_branch(dest, src);
+ if (!instr)
+ return 1;
+ }
+ }
+
+ patch_instruction(dest, instr);
+
+ return 0;
+}
+
+static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
+{
+ unsigned int *start, *end, *alt_start, *alt_end, *src, *dest;
+
+ start = calc_addr(fcur, fcur->start_off);
+ end = calc_addr(fcur, fcur->end_off);
+ alt_start = calc_addr(fcur, fcur->alt_start_off);
+ alt_end = calc_addr(fcur, fcur->alt_end_off);
+
+ if ((alt_end - alt_start) > (end - start))
+ return 1;
+
+ if ((value & fcur->mask) == fcur->value)
+ return 0;
+
+ src = alt_start;
+ dest = start;
+
+ for (; src < alt_end; src++, dest++) {
+ if (patch_alt_instruction(src, dest, alt_start, alt_end))
+ return 1;
+ }
+
+ for (; dest < end; dest++)
+ patch_instruction(dest, PPC_NOP_INSTR);
+
+ return 0;
+}
+
+void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
+{
+ struct fixup_entry *fcur, *fend;
+
+ fcur = fixup_start;
+ fend = fixup_end;
+
+ for (; fcur < fend; fcur++) {
+ if (patch_feature_section(value, fcur)) {
+ __WARN();
+ printk("Unable to patch feature section at %p - %p" \
+ " with %p - %p\n",
+ calc_addr(fcur, fcur->start_off),
+ calc_addr(fcur, fcur->end_off),
+ calc_addr(fcur, fcur->alt_start_off),
+ calc_addr(fcur, fcur->alt_end_off));
+ }
+ }
+}
+
+void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
+{
+ unsigned int *start, *end, *dest;
+
+ if (!(value & CPU_FTR_LWSYNC))
+ return ;
+
+ start = fixup_start;
+ end = fixup_end;
+
+ for (; start < end; start++) {
+ dest = (void *)start + *start;
+ patch_instruction(dest, PPC_LWSYNC_INSTR);
+ }
+}
+
+#ifdef CONFIG_FTR_FIXUP_SELFTEST
+
+#define check(x) \
+ if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
+
+/* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
+static struct fixup_entry fixup;
+
+static long calc_offset(struct fixup_entry *entry, unsigned int *p)
+{
+ return (unsigned long)p - (unsigned long)entry;
+}
+
+void test_basic_patching(void)
+{
+ extern unsigned int ftr_fixup_test1;
+ extern unsigned int end_ftr_fixup_test1;
+ extern unsigned int ftr_fixup_test1_orig;
+ extern unsigned int ftr_fixup_test1_expected;
+ int size = &end_ftr_fixup_test1 - &ftr_fixup_test1;
+
+ fixup.value = fixup.mask = 8;
+ fixup.start_off = calc_offset(&fixup, &ftr_fixup_test1 + 1);
+ fixup.end_off = calc_offset(&fixup, &ftr_fixup_test1 + 2);
+ fixup.alt_start_off = fixup.alt_end_off = 0;
+
+ /* Sanity check */
+ check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
+
+ /* Check we don't patch if the value matches */
+ patch_feature_section(8, &fixup);
+ check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
+
+ /* Check we do patch if the value doesn't match */
+ patch_feature_section(0, &fixup);
+ check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);
+
+ /* Check we do patch if the mask doesn't match */
+ memcpy(&ftr_fixup_test1, &ftr_fixup_test1_orig, size);
+ check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_orig, size) == 0);
+ patch_feature_section(~8, &fixup);
+ check(memcmp(&ftr_fixup_test1, &ftr_fixup_test1_expected, size) == 0);
+}
+
+static void test_alternative_patching(void)
+{
+ extern unsigned int ftr_fixup_test2;
+ extern unsigned int end_ftr_fixup_test2;
+ extern unsigned int ftr_fixup_test2_orig;
+ extern unsigned int ftr_fixup_test2_alt;
+ extern unsigned int ftr_fixup_test2_expected;
+ int size = &end_ftr_fixup_test2 - &ftr_fixup_test2;
+
+ fixup.value = fixup.mask = 0xF;
+ fixup.start_off = calc_offset(&fixup, &ftr_fixup_test2 + 1);
+ fixup.end_off = calc_offset(&fixup, &ftr_fixup_test2 + 2);
+ fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test2_alt);
+ fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test2_alt + 1);
+
+ /* Sanity check */
+ check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
+
+ /* Check we don't patch if the value matches */
+ patch_feature_section(0xF, &fixup);
+ check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
+
+ /* Check we do patch if the value doesn't match */
+ patch_feature_section(0, &fixup);
+ check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);
+
+ /* Check we do patch if the mask doesn't match */
+ memcpy(&ftr_fixup_test2, &ftr_fixup_test2_orig, size);
+ check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_orig, size) == 0);
+ patch_feature_section(~0xF, &fixup);
+ check(memcmp(&ftr_fixup_test2, &ftr_fixup_test2_expected, size) == 0);
+}
+
+static void test_alternative_case_too_big(void)
+{
+ extern unsigned int ftr_fixup_test3;
+ extern unsigned int end_ftr_fixup_test3;
+ extern unsigned int ftr_fixup_test3_orig;
+ extern unsigned int ftr_fixup_test3_alt;
+ int size = &end_ftr_fixup_test3 - &ftr_fixup_test3;
+
+ fixup.value = fixup.mask = 0xC;
+ fixup.start_off = calc_offset(&fixup, &ftr_fixup_test3 + 1);
+ fixup.end_off = calc_offset(&fixup, &ftr_fixup_test3 + 2);
+ fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test3_alt);
+ fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test3_alt + 2);
+
+ /* Sanity check */
+ check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
+
+ /* Expect nothing to be patched, and the error returned to us */
+ check(patch_feature_section(0xF, &fixup) == 1);
+ check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
+ check(patch_feature_section(0, &fixup) == 1);
+ check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
+ check(patch_feature_section(~0xF, &fixup) == 1);
+ check(memcmp(&ftr_fixup_test3, &ftr_fixup_test3_orig, size) == 0);
+}
+
+static void test_alternative_case_too_small(void)
+{
+ extern unsigned int ftr_fixup_test4;
+ extern unsigned int end_ftr_fixup_test4;
+ extern unsigned int ftr_fixup_test4_orig;
+ extern unsigned int ftr_fixup_test4_alt;
+ extern unsigned int ftr_fixup_test4_expected;
+ int size = &end_ftr_fixup_test4 - &ftr_fixup_test4;
+ unsigned long flag;
+
+ /* Check a high-bit flag */
+ flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
+ fixup.value = fixup.mask = flag;
+ fixup.start_off = calc_offset(&fixup, &ftr_fixup_test4 + 1);
+ fixup.end_off = calc_offset(&fixup, &ftr_fixup_test4 + 5);
+ fixup.alt_start_off = calc_offset(&fixup, &ftr_fixup_test4_alt);
+ fixup.alt_end_off = calc_offset(&fixup, &ftr_fixup_test4_alt + 2);
+
+ /* Sanity check */
+ check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
+
+ /* Check we don't patch if the value matches */
+ patch_feature_section(flag, &fixup);
+ check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
+
+ /* Check we do patch if the value doesn't match */
+ patch_feature_section(0, &fixup);
+ check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);
+
+ /* Check we do patch if the mask doesn't match */
+ memcpy(&ftr_fixup_test4, &ftr_fixup_test4_orig, size);
+ check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_orig, size) == 0);
+ patch_feature_section(~flag, &fixup);
+ check(memcmp(&ftr_fixup_test4, &ftr_fixup_test4_expected, size) == 0);
+}
+
+static void test_alternative_case_with_branch(void)
+{
+ extern unsigned int ftr_fixup_test5;
+ extern unsigned int end_ftr_fixup_test5;
+ extern unsigned int ftr_fixup_test5_expected;
+ int size = &end_ftr_fixup_test5 - &ftr_fixup_test5;
+
+ check(memcmp(&ftr_fixup_test5, &ftr_fixup_test5_expected, size) == 0);
+}
+
+static void test_alternative_case_with_external_branch(void)
+{
+ extern unsigned int ftr_fixup_test6;
+ extern unsigned int end_ftr_fixup_test6;
+ extern unsigned int ftr_fixup_test6_expected;
+ int size = &end_ftr_fixup_test6 - &ftr_fixup_test6;
+
+ check(memcmp(&ftr_fixup_test6, &ftr_fixup_test6_expected, size) == 0);
+}
+
+static void test_cpu_macros(void)
+{
+ extern void ftr_fixup_test_FTR_macros;
+ extern void ftr_fixup_test_FTR_macros_expected;
+ unsigned long size = &ftr_fixup_test_FTR_macros_expected -
+ &ftr_fixup_test_FTR_macros;
+
+ /* The fixups have already been done for us during boot */
+ check(memcmp(&ftr_fixup_test_FTR_macros,
+ &ftr_fixup_test_FTR_macros_expected, size) == 0);
+}
+
+static void test_fw_macros(void)
+{
+#ifdef CONFIG_PPC64
+ extern void ftr_fixup_test_FW_FTR_macros;
+ extern void ftr_fixup_test_FW_FTR_macros_expected;
+ unsigned long size = &ftr_fixup_test_FW_FTR_macros_expected -
+ &ftr_fixup_test_FW_FTR_macros;
+
+ /* The fixups have already been done for us during boot */
+ check(memcmp(&ftr_fixup_test_FW_FTR_macros,
+ &ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
+#endif
+}
+
+static void test_lwsync_macros(void)
+{
+ extern void lwsync_fixup_test;
+ extern void end_lwsync_fixup_test;
+ extern void lwsync_fixup_test_expected_LWSYNC;
+ extern void lwsync_fixup_test_expected_SYNC;
+ unsigned long size = &end_lwsync_fixup_test -
+ &lwsync_fixup_test;
+
+ /* The fixups have already been done for us during boot */
+ if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
+ check(memcmp(&lwsync_fixup_test,
+ &lwsync_fixup_test_expected_LWSYNC, size) == 0);
+ } else {
+ check(memcmp(&lwsync_fixup_test,
+ &lwsync_fixup_test_expected_SYNC, size) == 0);
+ }
+}
+
+static int __init test_feature_fixups(void)
+{
+ printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
+
+ test_basic_patching();
+ test_alternative_patching();
+ test_alternative_case_too_big();
+ test_alternative_case_too_small();
+ test_alternative_case_with_branch();
+ test_alternative_case_with_external_branch();
+ test_cpu_macros();
+ test_fw_macros();
+ test_lwsync_macros();
+
+ return 0;
+}
+late_initcall(test_feature_fixups);
+
+#endif /* CONFIG_FTR_FIXUP_SELFTEST */
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-24 13:43:49 +0000