name : feature-fixups.h /* 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 */