diff options
| -rw-r--r-- | payloads/libpayload/arch/arm64/cpu.S | 15 | ||||
| -rw-r--r-- | payloads/libpayload/arch/arm64/head.S | 4 | ||||
| -rw-r--r-- | payloads/libpayload/arch/arm64/mmu.c | 24 | ||||
| -rw-r--r-- | payloads/libpayload/include/arm64/arch/cache.h | 32 | ||||
| -rw-r--r-- | payloads/libpayload/include/arm64/arch/lib_helpers.h | 20 |
5 files changed, 39 insertions, 56 deletions
diff --git a/payloads/libpayload/arch/arm64/cpu.S b/payloads/libpayload/arch/arm64/cpu.S index d80f73c11273..70a1044b0218 100644 --- a/payloads/libpayload/arch/arm64/cpu.S +++ b/payloads/libpayload/arch/arm64/cpu.S @@ -29,6 +29,7 @@ */ #include <arch/asm.h> +#include <arch/lib_helpers.h> .macro dcache_apply_all crm dsb sy @@ -96,3 +97,17 @@ ENDPROC(dcache_clean_all) ENTRY(dcache_clean_invalidate_all) dcache_apply_all crm=cisw ENDPROC(dcache_clean_invalidate_all) + +/* This must be implemented in assembly to ensure there are no accesses to + memory (e.g. the stack) in between disabling and flushing the cache. */ +ENTRY(mmu_disable) + str x30, [sp, #-0x8] + mrs x0, sctlr_el2 + mov x1, #~(SCTLR_C | SCTLR_M) + and x0, x0, x1 + msr sctlr_el2, x0 + isb + bl dcache_clean_invalidate_all + ldr x30, [sp, #-0x8] + ret +ENDPROC(mmu_disable) diff --git a/payloads/libpayload/arch/arm64/head.S b/payloads/libpayload/arch/arm64/head.S index 8bac70fee51d..c44169b82a3c 100644 --- a/payloads/libpayload/arch/arm64/head.S +++ b/payloads/libpayload/arch/arm64/head.S @@ -28,11 +28,15 @@ */ #include <arch/asm.h> +#include <arch/lib_helpers.h> /* * Our entry point */ ENTRY(_entry) + /* Initialize SCTLR to intended state (icache and stack-alignment on) */ + ldr w1, =(SCTLR_RES1 | SCTLR_I | SCTLR_SA) + msr sctlr_el2, x1 /* Save off the location of the coreboot tables */ ldr x1, 1f diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c index d1dd5b01473c..3a5e04db6cb5 100644 --- a/payloads/libpayload/arch/arm64/mmu.c +++ b/payloads/libpayload/arch/arm64/mmu.c @@ -304,30 +304,6 @@ static uint32_t is_mmu_enabled(void) } /* - * Func: mmu_disable - * Desc: Invalidate caches and disable mmu - */ -void mmu_disable(void) -{ - uint32_t sctlr; - - sctlr = raw_read_sctlr_el2(); - sctlr &= ~(SCTLR_C | SCTLR_M | SCTLR_I); - - tlbiall_el2(); - dcache_clean_invalidate_all(); - - dsb(); - isb(); - - raw_write_sctlr_el2(sctlr); - - dcache_clean_invalidate_all(); - dsb(); - isb(); -} - -/* * Func: mmu_enable * Desc: Initialize MAIR, TCR, TTBR and enable MMU by setting appropriate bits * in SCTLR diff --git a/payloads/libpayload/include/arm64/arch/cache.h b/payloads/libpayload/include/arm64/arch/cache.h index de68cee3f110..ace0e0ecd623 100644 --- a/payloads/libpayload/include/arm64/arch/cache.h +++ b/payloads/libpayload/include/arm64/arch/cache.h @@ -35,38 +35,6 @@ #include <stddef.h> #include <stdint.h> -/* SCTLR bits */ -#define SCTLR_M (1 << 0) /* MMU enable */ -#define SCTLR_A (1 << 1) /* Alignment check enable */ -#define SCTLR_C (1 << 2) /* Data/unified cache enable */ -/* Bits 4:3 are reserved */ -#define SCTLR_CP15BEN (1 << 5) /* CP15 barrier enable */ -/* Bit 6 is reserved */ -#define SCTLR_B (1 << 7) /* Endianness */ -/* Bits 9:8 */ -#define SCTLR_SW (1 << 10) /* SWP and SWPB enable */ -#define SCTLR_Z (1 << 11) /* Branch prediction enable */ -#define SCTLR_I (1 << 12) /* Instruction cache enable */ -#define SCTLR_V (1 << 13) /* Low/high exception vectors */ -#define SCTLR_RR (1 << 14) /* Round Robin select */ -/* Bits 16:15 are reserved */ -#define SCTLR_HA (1 << 17) /* Hardware Access flag enable */ -/* Bit 18 is reserved */ -/* Bits 20:19 reserved virtualization not supported */ -#define SCTLR_WXN (1 << 19) /* Write permission implies XN */ -#define SCTLR_UWXN (1 << 20) /* Unprivileged write permission - implies PL1 XN */ -#define SCTLR_FI (1 << 21) /* Fast interrupt config enable */ -#define SCTLR_U (1 << 22) /* Unaligned access behavior */ -#define SCTLR_VE (1 << 24) /* Interrupt vectors enable */ -#define SCTLR_EE (1 << 25) /* Exception endianness */ -/* Bit 26 is reserved */ -#define SCTLR_NMFI (1 << 27) /* Non-maskable FIQ support */ -#define SCTLR_TRE (1 << 28) /* TEX remap enable */ -#define SCTLR_AFE (1 << 29) /* Access flag enable */ -#define SCTLR_TE (1 << 30) /* Thumb exception enable */ -/* Bit 31 is reserved */ - /* * Cache maintenance API */ diff --git a/payloads/libpayload/include/arm64/arch/lib_helpers.h b/payloads/libpayload/include/arm64/arch/lib_helpers.h index 7617f974267c..b2e3a069e025 100644 --- a/payloads/libpayload/include/arm64/arch/lib_helpers.h +++ b/payloads/libpayload/include/arm64/arch/lib_helpers.h @@ -30,11 +30,29 @@ #ifndef __ARCH_LIB_HELPERS_H__ #define __ARCH_LIB_HELPERS_H__ +#define SCTLR_M (1 << 0) /* MMU enable */ +#define SCTLR_A (1 << 1) /* Alignment check enable */ +#define SCTLR_C (1 << 2) /* Data/unified cache enable */ +#define SCTLR_SA (1 << 3) /* Stack alignment check enable */ +#define SCTLR_NAA (1 << 6) /* non-aligned access STA/LDR */ +#define SCTLR_I (1 << 12) /* Instruction cache enable */ +#define SCTLR_ENDB (1 << 13) /* Pointer auth (data B) */ +#define SCTLR_WXN (1 << 19) /* Write permission implies XN */ +#define SCTLR_IESB (1 << 21) /* Implicit error sync event */ +#define SCTLR_EE (1 << 25) /* Exception endianness (BE) */ +#define SCTLR_ENDA (1 << 27) /* Pointer auth (data A) */ +#define SCTLR_ENIB (1 << 30) /* Pointer auth (insn B) */ +#define SCTLR_ENIA (1 << 31) /* Pointer auth (insn A) */ +#define SCTLR_RES1 ((0x3 << 4) | (0x1 << 11) | (0x1 << 16) | \ + (0x1 << 18) | (0x3 << 22) | (0x3 << 28)) + #define DAIF_DBG_BIT (1 << 3) #define DAIF_ABT_BIT (1 << 2) #define DAIF_IRQ_BIT (1 << 1) #define DAIF_FIQ_BIT (1 << 0) +#ifndef __ASSEMBLER__ + #include <stdint.h> #define MAKE_REGISTER_ACCESSORS(reg) \ @@ -273,4 +291,6 @@ static inline void tlbivaa_el1(uint64_t va) #define dsb() dsb_opt(sy) #define isb() isb_opt() +#endif /* __ASSEMBLER__ */ + #endif /* __ARCH_LIB_HELPERS_H__ */ |