diff options
Diffstat (limited to 'arch/powerpc/include/asm/feature-fixups.h')
| -rw-r--r-- | arch/powerpc/include/asm/feature-fixups.h | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/feature-fixups.h b/arch/powerpc/include/asm/feature-fixups.h new file mode 100644 index 000000000..77824bd28 --- /dev/null +++ b/arch/powerpc/include/asm/feature-fixups.h @@ -0,0 +1,299 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __ASM_POWERPC_FEATURE_FIXUPS_H +#define __ASM_POWERPC_FEATURE_FIXUPS_H + +#include <asm/asm-const.h> + +/* + */ + +/* + * Feature section common macros + * + * Note that the entries now contain offsets between the table entry + * and the code rather than absolute code pointers in order to be + * useable with the vdso shared library. There is also an assumption + * that values will be negative, that is, the fixup table has to be + * located after the code it fixes up. + */ +#if defined(CONFIG_PPC64) && !defined(__powerpc64__) +/* 64 bits kernel, 32 bits code (ie. vdso32) */ +#define FTR_ENTRY_LONG .8byte +#define FTR_ENTRY_OFFSET .long 0xffffffff; .long +#elif defined(CONFIG_PPC64) +#define FTR_ENTRY_LONG .8byte +#define FTR_ENTRY_OFFSET .8byte +#else +#define FTR_ENTRY_LONG .long +#define FTR_ENTRY_OFFSET .long +#endif + +#define START_FTR_SECTION(label) label##1: + +#define FTR_SECTION_ELSE_NESTED(label) \ +label##2: \ + .pushsection __ftr_alt_##label,"a"; \ + .align 2; \ +label##3: + + +#ifndef CONFIG_CC_IS_CLANG +#define CHECK_ALT_SIZE(else_size, body_size) \ + .ifgt (else_size) - (body_size); \ + .error "Feature section else case larger than body"; \ + .endif; +#else +/* + * If we use the ifgt syntax above, clang's assembler complains about the + * expression being non-absolute when the code appears in an inline assembly + * statement. + * As a workaround use an .org directive that has no effect if the else case + * instructions are smaller than the body, but fails otherwise. + */ +#define CHECK_ALT_SIZE(else_size, body_size) \ + .org . + ((else_size) > (body_size)); +#endif + +#define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \ +label##4: \ + .popsection; \ + .pushsection sect,"a"; \ + .align 3; \ +label##5: \ + FTR_ENTRY_LONG msk; \ + FTR_ENTRY_LONG val; \ + FTR_ENTRY_OFFSET label##1b-label##5b; \ + FTR_ENTRY_OFFSET label##2b-label##5b; \ + FTR_ENTRY_OFFSET label##3b-label##5b; \ + FTR_ENTRY_OFFSET label##4b-label##5b; \ + CHECK_ALT_SIZE((label##4b-label##3b), (label##2b-label##1b)); \ + .popsection; + + +/* CPU feature dependent sections */ +#define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) +#define BEGIN_FTR_SECTION START_FTR_SECTION(97) + +#define END_FTR_SECTION_NESTED(msk, val, label) \ + FTR_SECTION_ELSE_NESTED(label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) + +#define END_FTR_SECTION(msk, val) \ + END_FTR_SECTION_NESTED(msk, val, 97) + +#define END_FTR_SECTION_NESTED_IFSET(msk, label) \ + END_FTR_SECTION_NESTED((msk), (msk), label) + +#define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk)) +#define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0) + +/* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ +#define FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) +#define ALT_FTR_SECTION_END_NESTED(msk, val, label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) +#define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label) \ + ALT_FTR_SECTION_END_NESTED(msk, msk, label) +#define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ + ALT_FTR_SECTION_END_NESTED(msk, 0, label) +#define ALT_FTR_SECTION_END(msk, val) \ + ALT_FTR_SECTION_END_NESTED(msk, val, 97) +#define ALT_FTR_SECTION_END_IFSET(msk) \ + ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97) +#define ALT_FTR_SECTION_END_IFCLR(msk) \ + ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97) + +/* MMU feature dependent sections */ +#define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) +#define BEGIN_MMU_FTR_SECTION START_FTR_SECTION(97) + +#define END_MMU_FTR_SECTION_NESTED(msk, val, label) \ + FTR_SECTION_ELSE_NESTED(label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) + +#define END_MMU_FTR_SECTION(msk, val) \ + END_MMU_FTR_SECTION_NESTED(msk, val, 97) + +#define END_MMU_FTR_SECTION_NESTED_IFSET(msk, label) \ + END_MMU_FTR_SECTION_NESTED((msk), (msk), label) + +#define END_MMU_FTR_SECTION_NESTED_IFCLR(msk, label) \ + END_MMU_FTR_SECTION_NESTED((msk), 0, label) + +#define END_MMU_FTR_SECTION_IFSET(msk) END_MMU_FTR_SECTION((msk), (msk)) +#define END_MMU_FTR_SECTION_IFCLR(msk) END_MMU_FTR_SECTION((msk), 0) + +/* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ +#define MMU_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) +#define MMU_FTR_SECTION_ELSE MMU_FTR_SECTION_ELSE_NESTED(97) +#define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) +#define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label) \ + ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label) +#define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ + ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label) +#define ALT_MMU_FTR_SECTION_END(msk, val) \ + ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97) +#define ALT_MMU_FTR_SECTION_END_IFSET(msk) \ + ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97) +#define ALT_MMU_FTR_SECTION_END_IFCLR(msk) \ + ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97) + +/* Firmware feature dependent sections */ +#define BEGIN_FW_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) +#define BEGIN_FW_FTR_SECTION START_FTR_SECTION(97) + +#define END_FW_FTR_SECTION_NESTED(msk, val, label) \ + FTR_SECTION_ELSE_NESTED(label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) + +#define END_FW_FTR_SECTION(msk, val) \ + END_FW_FTR_SECTION_NESTED(msk, val, 97) + +#define END_FW_FTR_SECTION_IFSET(msk) END_FW_FTR_SECTION((msk), (msk)) +#define END_FW_FTR_SECTION_IFCLR(msk) END_FW_FTR_SECTION((msk), 0) + +/* Firmware feature sections with alternatives */ +#define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) +#define FW_FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) +#define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label) \ + MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) +#define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \ + ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label) +#define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ + ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label) +#define ALT_FW_FTR_SECTION_END(msk, val) \ + ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97) +#define ALT_FW_FTR_SECTION_END_IFSET(msk) \ + ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97) +#define ALT_FW_FTR_SECTION_END_IFCLR(msk) \ + ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97) + +#ifndef __ASSEMBLY__ + +#define ASM_FTR_IF(section_if, section_else, msk, val) \ + stringify_in_c(BEGIN_FTR_SECTION) \ + section_if "; " \ + stringify_in_c(FTR_SECTION_ELSE) \ + section_else "; " \ + stringify_in_c(ALT_FTR_SECTION_END((msk), (val))) + +#define ASM_FTR_IFSET(section_if, section_else, msk) \ + ASM_FTR_IF(section_if, section_else, (msk), (msk)) + +#define ASM_FTR_IFCLR(section_if, section_else, msk) \ + ASM_FTR_IF(section_if, section_else, (msk), 0) + +#define ASM_MMU_FTR_IF(section_if, section_else, msk, val) \ + stringify_in_c(BEGIN_MMU_FTR_SECTION) \ + section_if "; " \ + stringify_in_c(MMU_FTR_SECTION_ELSE) \ + section_else "; " \ + stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val))) + +#define ASM_MMU_FTR_IFSET(section_if, section_else, msk) \ + ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk)) + +#define ASM_MMU_FTR_IFCLR(section_if, section_else, msk) \ + ASM_MMU_FTR_IF(section_if, section_else, (msk), 0) + +#endif /* __ASSEMBLY__ */ + +/* LWSYNC feature sections */ +#define START_LWSYNC_SECTION(label) label##1: +#define MAKE_LWSYNC_SECTION_ENTRY(label, sect) \ +label##2: \ + .pushsection sect,"a"; \ + .align 2; \ +label##3: \ + FTR_ENTRY_OFFSET label##1b-label##3b; \ + .popsection; + +#define STF_ENTRY_BARRIER_FIXUP_SECTION \ +953: \ + .pushsection __stf_entry_barrier_fixup,"a"; \ + .align 2; \ +954: \ + FTR_ENTRY_OFFSET 953b-954b; \ + .popsection; + +#define STF_EXIT_BARRIER_FIXUP_SECTION \ +955: \ + .pushsection __stf_exit_barrier_fixup,"a"; \ + .align 2; \ +956: \ + FTR_ENTRY_OFFSET 955b-956b; \ + .popsection; + +#define UACCESS_FLUSH_FIXUP_SECTION \ +959: \ + .pushsection __uaccess_flush_fixup,"a"; \ + .align 2; \ +960: \ + FTR_ENTRY_OFFSET 959b-960b; \ + .popsection; + +#define ENTRY_FLUSH_FIXUP_SECTION \ +957: \ + .pushsection __entry_flush_fixup,"a"; \ + .align 2; \ +958: \ + FTR_ENTRY_OFFSET 957b-958b; \ + .popsection; + +#define SCV_ENTRY_FLUSH_FIXUP_SECTION \ +957: \ + .pushsection __scv_entry_flush_fixup,"a"; \ + .align 2; \ +958: \ + FTR_ENTRY_OFFSET 957b-958b; \ + .popsection; + +#define RFI_FLUSH_FIXUP_SECTION \ +951: \ + .pushsection __rfi_flush_fixup,"a"; \ + .align 2; \ +952: \ + FTR_ENTRY_OFFSET 951b-952b; \ + .popsection; + +#define NOSPEC_BARRIER_FIXUP_SECTION \ +953: \ + .pushsection __barrier_nospec_fixup,"a"; \ + .align 2; \ +954: \ + FTR_ENTRY_OFFSET 953b-954b; \ + .popsection; + +#define START_BTB_FLUSH_SECTION \ +955: \ + +#define END_BTB_FLUSH_SECTION \ +956: \ + .pushsection __btb_flush_fixup,"a"; \ + .align 2; \ +957: \ + FTR_ENTRY_OFFSET 955b-957b; \ + FTR_ENTRY_OFFSET 956b-957b; \ + .popsection; + +#ifndef __ASSEMBLY__ +#include <linux/types.h> + +extern long stf_barrier_fallback; +extern long entry_flush_fallback; +extern long scv_entry_flush_fallback; +extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup; +extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup; +extern long __start___uaccess_flush_fixup, __stop___uaccess_flush_fixup; +extern long __start___entry_flush_fixup, __stop___entry_flush_fixup; +extern long __start___scv_entry_flush_fixup, __stop___scv_entry_flush_fixup; +extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup; +extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup; +extern long __start__btb_flush_fixup, __stop__btb_flush_fixup; + +void apply_feature_fixups(void); +void update_mmu_feature_fixups(unsigned long mask); +void setup_feature_keys(void); +#endif + +#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */ |