diff options
| -rw-r--r-- | arch/x86/cpu/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/cpu/coreboot/coreboot.c | 22 | ||||
| -rw-r--r-- | arch/x86/cpu/ivybridge/car.S | 12 | ||||
| -rw-r--r-- | arch/x86/cpu/mtrr.c | 81 | ||||
| -rw-r--r-- | arch/x86/include/asm/global_data.h | 15 | ||||
| -rw-r--r-- | arch/x86/include/asm/mtrr.h | 157 |
6 files changed, 187 insertions, 101 deletions
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 5033d2b..62e43c0 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -17,5 +17,6 @@ obj-$(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) += ivybridge/ obj-$(CONFIG_NORTHBRIDGE_INTEL_IVYBRIDGE) += ivybridge/ obj-$(CONFIG_INTEL_QUEENSBAY) += queensbay/ obj-y += lapic.o +obj-y += mtrr.o obj-$(CONFIG_PCI) += pci.o obj-y += turbo.o diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c index cfacc05..6d06d5a 100644 --- a/arch/x86/cpu/coreboot/coreboot.c +++ b/arch/x86/cpu/coreboot/coreboot.c @@ -15,6 +15,7 @@ #include <asm/cache.h> #include <asm/cpu.h> #include <asm/io.h> +#include <asm/mtrr.h> #include <asm/arch/tables.h> #include <asm/arch/sysinfo.h> #include <asm/arch/timestamp.h> @@ -64,11 +65,6 @@ int board_eth_init(bd_t *bis) return pci_eth_init(bis); } -#define MTRR_TYPE_WP 5 -#define MTRRcap_MSR 0xfe -#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) -#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) - void board_final_cleanup(void) { /* Un-cache the ROM so the kernel has one @@ -77,15 +73,17 @@ void board_final_cleanup(void) * Coreboot should have assigned this to the * top available variable MTRR. */ - u8 top_mtrr = (native_read_msr(MTRRcap_MSR) & 0xff) - 1; - u8 top_type = native_read_msr(MTRRphysBase_MSR(top_mtrr)) & 0xff; + u8 top_mtrr = (native_read_msr(MTRR_CAP_MSR) & 0xff) - 1; + u8 top_type = native_read_msr(MTRR_PHYS_BASE_MSR(top_mtrr)) & 0xff; /* Make sure this MTRR is the correct Write-Protected type */ - if (top_type == MTRR_TYPE_WP) { - disable_caches(); - wrmsrl(MTRRphysBase_MSR(top_mtrr), 0); - wrmsrl(MTRRphysMask_MSR(top_mtrr), 0); - enable_caches(); + if (top_type == MTRR_TYPE_WRPROT) { + struct mtrr_state state; + + mtrr_open(&state); + wrmsrl(MTRR_PHYS_BASE_MSR(top_mtrr), 0); + wrmsrl(MTRR_PHYS_MASK_MSR(top_mtrr), 0); + mtrr_close(&state); } /* Issue SMI to Coreboot to lock down ME and registers */ diff --git a/arch/x86/cpu/ivybridge/car.S b/arch/x86/cpu/ivybridge/car.S index dca68e4..72b22ea 100644 --- a/arch/x86/cpu/ivybridge/car.S +++ b/arch/x86/cpu/ivybridge/car.S @@ -61,7 +61,7 @@ clear_mtrrs: post_code(POST_CAR_MTRR) /* Configure the default memory type to uncacheable */ - movl $MTRRdefType_MSR, %ecx + movl $MTRR_DEF_TYPE_MSR, %ecx rdmsr andl $(~0x00000cff), %eax wrmsr @@ -76,16 +76,16 @@ clear_mtrrs: post_code(POST_CAR_BASE_ADDRESS) /* Set Cache-as-RAM mask */ movl $(MTRR_PHYS_MASK_MSR(0)), %ecx - movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRRphysMaskValid), %eax + movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax movl $CPU_PHYSMASK_HI, %edx wrmsr post_code(POST_CAR_MASK) /* Enable MTRR */ - movl $MTRRdefType_MSR, %ecx + movl $MTRR_DEF_TYPE_MSR, %ecx rdmsr - orl $MTRRdefTypeEn, %eax + orl $MTRR_DEF_TYPE_EN, %eax wrmsr /* Enable cache (CR0.CD = 0, CR0.NW = 0) */ @@ -130,7 +130,7 @@ clear_mtrrs: movl $MTRR_PHYS_MASK_MSR(1), %ecx movl $CPU_PHYSMASK_HI, %edx - movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax + movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax wrmsr post_code(POST_CAR_ROM_CACHE) @@ -141,7 +141,7 @@ clear_mtrrs: xorl %edx, %edx wrmsr movl $MTRR_PHYS_MASK_MSR(2), %ecx - movl $(CACHE_MRC_MASK | MTRRphysMaskValid), %eax + movl $(CACHE_MRC_MASK | MTRR_PHYS_MASK_VALID), %eax movl $CPU_PHYSMASK_HI, %edx wrmsr #endif diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c new file mode 100644 index 0000000..d5a825d --- /dev/null +++ b/arch/x86/cpu/mtrr.c @@ -0,0 +1,81 @@ +/* + * (C) Copyright 2014 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + * + * Memory Type Range Regsters - these are used to tell the CPU whether + * memory is cacheable and if so the cache write mode to use. + * + * These can speed up booting. See the mtrr command. + * + * Reference: Intel Architecture Software Developer's Manual, Volume 3: + * System Programming + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/msr.h> +#include <asm/mtrr.h> + +/* Prepare to adjust MTRRs */ +void mtrr_open(struct mtrr_state *state) +{ + state->enable_cache = dcache_status(); + + if (state->enable_cache) + disable_caches(); + state->deftype = native_read_msr(MTRR_DEF_TYPE_MSR); + wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype & ~MTRR_DEF_TYPE_EN); +} + +/* Clean up after adjusting MTRRs, and enable them */ +void mtrr_close(struct mtrr_state *state) +{ + wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype | MTRR_DEF_TYPE_EN); + if (state->enable_cache) + enable_caches(); +} + +int mtrr_commit(bool do_caches) +{ + struct mtrr_request *req = gd->arch.mtrr_req; + struct mtrr_state state; + uint64_t mask; + int i; + + mtrr_open(&state); + for (i = 0; i < gd->arch.mtrr_req_count; i++, req++) { + mask = ~(req->size - 1); + mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1; + wrmsrl(MTRR_PHYS_BASE_MSR(i), req->start | req->type); + wrmsrl(MTRR_PHYS_MASK_MSR(i), mask | MTRR_PHYS_MASK_VALID); + } + + /* Clear the ones that are unused */ + for (; i < MTRR_COUNT; i++) + wrmsrl(MTRR_PHYS_MASK_MSR(i), 0); + mtrr_close(&state); + + return 0; +} + +int mtrr_add_request(int type, uint64_t start, uint64_t size) +{ + struct mtrr_request *req; + uint64_t mask; + + if (gd->arch.mtrr_req_count == MAX_MTRR_REQUESTS) + return -ENOSPC; + req = &gd->arch.mtrr_req[gd->arch.mtrr_req_count++]; + req->type = type; + req->start = start; + req->size = size; + debug("%d: type=%d, %08llx %08llx\n", gd->arch.mtrr_req_count - 1, + req->type, req->start, req->size); + mask = ~(req->size - 1); + mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1; + mask |= MTRR_PHYS_MASK_VALID; + debug(" %016llx %016llx\n", req->start | req->type, mask); + + return 0; +} diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index aeab3e5..24e3052 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -29,6 +29,19 @@ struct memory_info { struct memory_area area[CONFIG_NR_DRAM_BANKS]; }; +#define MAX_MTRR_REQUESTS 8 + +/** + * A request for a memory region to be set up in a particular way. These + * requests are processed before board_init_r() is called. They are generally + * optional and can be ignored with some performance impact. + */ +struct mtrr_request { + int type; /* MTRR_TYPE_... */ + uint64_t start; + uint64_t size; +}; + /* Architecture-specific global data */ struct arch_global_data { struct global_data *gd_addr; /* Location of Global Data */ @@ -49,6 +62,8 @@ struct arch_global_data { #ifdef CONFIG_HAVE_FSP void *hob_list; /* FSP HOB list */ #endif + struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS]; + int mtrr_req_count; }; #endif diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h index dcc995d..3c11740 100644 --- a/arch/x86/include/asm/mtrr.h +++ b/arch/x86/include/asm/mtrr.h @@ -9,94 +9,85 @@ #ifndef _ASM_MTRR_H #define _ASM_MTRR_H -/* These are the region types */ -#define MTRR_TYPE_UNCACHEABLE 0 -#define MTRR_TYPE_WRCOMB 1 -/*#define MTRR_TYPE_ 2*/ -/*#define MTRR_TYPE_ 3*/ -#define MTRR_TYPE_WRTHROUGH 4 -#define MTRR_TYPE_WRPROT 5 -#define MTRR_TYPE_WRBACK 6 -#define MTRR_NUM_TYPES 7 - -#define MTRRcap_MSR 0x0fe -#define MTRRdefType_MSR 0x2ff - -#define MTRRdefTypeEn (1 << 11) -#define MTRRdefTypeFixEn (1 << 10) - -#define SMRRphysBase_MSR 0x1f2 -#define SMRRphysMask_MSR 0x1f3 - -#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) -#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) - -#define MTRRphysMaskValid (1 << 11) - -#define NUM_FIXED_RANGES 88 -#define RANGES_PER_FIXED_MTRR 8 -#define MTRRfix64K_00000_MSR 0x250 -#define MTRRfix16K_80000_MSR 0x258 -#define MTRRfix16K_A0000_MSR 0x259 -#define MTRRfix4K_C0000_MSR 0x268 -#define MTRRfix4K_C8000_MSR 0x269 -#define MTRRfix4K_D0000_MSR 0x26a -#define MTRRfix4K_D8000_MSR 0x26b -#define MTRRfix4K_E0000_MSR 0x26c -#define MTRRfix4K_E8000_MSR 0x26d -#define MTRRfix4K_F0000_MSR 0x26e -#define MTRRfix4K_F8000_MSR 0x26f +/* MTRR region types */ +#define MTRR_TYPE_UNCACHEABLE 0 +#define MTRR_TYPE_WRCOMB 1 +#define MTRR_TYPE_WRTHROUGH 4 +#define MTRR_TYPE_WRPROT 5 +#define MTRR_TYPE_WRBACK 6 + +#define MTRR_TYPE_COUNT 7 + +#define MTRR_CAP_MSR 0x0fe +#define MTRR_DEF_TYPE_MSR 0x2ff + +#define MTRR_DEF_TYPE_EN (1 << 11) +#define MTRR_DEF_TYPE_FIX_EN (1 << 10) + +#define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg)) +#define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1) + +#define MTRR_PHYS_MASK_VALID (1 << 11) + +#define MTRR_BASE_TYPE_MASK 0x7 + +/* Number of MTRRs supported */ +#define MTRR_COUNT 8 #if !defined(__ASSEMBLER__) -/* - * The MTRR code has some side effects that the callers should be aware for. - * 1. The call sequence matters. x86_setup_mtrrs() calls - * x86_setup_fixed_mtrrs_no_enable() then enable_fixed_mtrrs() (equivalent - * of x86_setup_fixed_mtrrs()) then x86_setup_var_mtrrs(). If the callers - * want to call the components of x86_setup_mtrrs() because of other - * rquirements the ordering should still preserved. - * 2. enable_fixed_mtrr() will enable both variable and fixed MTRRs because - * of the nature of the global MTRR enable flag. Therefore, all direct - * or indirect callers of enable_fixed_mtrr() should ensure that the - * variable MTRR MSRs do not contain bad ranges. - * 3. If CONFIG_CACHE_ROM is selected an MTRR is allocated for enabling - * the caching of the ROM. However, it is set to uncacheable (UC). It - * is the responsiblity of the caller to enable it by calling - * x86_mtrr_enable_rom_caching(). +/** + * Information about the previous MTRR state, set up by mtrr_open() + * + * @deftype: Previous value of MTRR_DEF_TYPE_MSR + * @enable_cache: true if cache was enabled */ -void x86_setup_mtrrs(void); -/* - * x86_setup_var_mtrrs() parameters: - * address_bits - number of physical address bits supported by cpu - * above4gb - 2 means dynamically detect number of variable MTRRs available. - * non-zero means handle memory ranges above 4GiB. - * 0 means ignore memory ranges above 4GiB +struct mtrr_state { + uint64_t deftype; + bool enable_cache; +}; + +/** + * mtrr_open() - Prepare to adjust MTRRs + * + * Use mtrr_open() passing in a structure - this function will init it. Then + * when done, pass the same structure to mtrr_close() to re-enable MTRRs and + * possibly the cache. + * + * @state: Empty structure to pass in to hold settings + */ +void mtrr_open(struct mtrr_state *state); + +/** + * mtrr_open() - Clean up after adjusting MTRRs, and enable them + * + * This uses the structure containing information returned from mtrr_open(). + * + * @state: Structure from mtrr_open() + */ +/* */ +void mtrr_close(struct mtrr_state *state); + +/** + * mtrr_add_request() - Add a new MTRR request + * + * This adds a request for a memory region to be set up in a particular way. + * + * @type: Requested type (MTRR_TYPE_) + * @start: Start address + * @size: Size + */ +int mtrr_add_request(int type, uint64_t start, uint64_t size); + +/** + * mtrr_commit() - set up the MTRR registers based on current requests + * + * This sets up MTRRs for the available DRAM and the requests received so far. + * It must be called with caches disabled. + * + * @do_caches: true if caches are currently on */ -void x86_setup_var_mtrrs(unsigned int address_bits, unsigned int above4gb); -void enable_fixed_mtrr(void); -void x86_setup_fixed_mtrrs(void); -/* Set up fixed MTRRs but do not enable them. */ -void x86_setup_fixed_mtrrs_no_enable(void); -int x86_mtrr_check(void); -/* ROM caching can be used after variable MTRRs are set up. Beware that - * enabling CONFIG_CACHE_ROM will eat through quite a few MTRRs based on - * one's IO hole size and WRCOMB resources. Be sure to check the console - * log when enabling CONFIG_CACHE_ROM or adding WRCOMB resources. Beware that - * on CPUs with core-scoped MTRR registers such as hyperthreaded CPUs the - * rom caching will be disabled if all threads run the MTRR code. Therefore, - * one needs to call x86_mtrr_enable_rom_caching() after all threads of the - * same core have run the MTRR code. */ -#if CONFIG_CACHE_ROM -void x86_mtrr_enable_rom_caching(void); -void x86_mtrr_disable_rom_caching(void); -/* Return the variable range MTRR index of the ROM cache. */ -long x86_mtrr_rom_cache_var_index(void); -#else -static inline void x86_mtrr_enable_rom_caching(void) {} -static inline void x86_mtrr_disable_rom_caching(void) {} -static inline long x86_mtrr_rom_cache_var_index(void) { return -1; } -#endif /* CONFIG_CACHE_ROM */ +int mtrr_commit(bool do_caches); #endif |