X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=arch%2Fx86%2Finclude%2Fasm%2Fmtrr.h;h=2d897f82ef791157210f9142d1dbaddeeedb36a9;hb=3d5ced9e22d32112a20f9dc0f5fb1f22ef088079;hp=5f05a4848f66c7aa194f80b126783b259b24bbf0;hpb=1fc4e6f486cc1e9d2dcf0ba86e6021c3d83dce51;p=platform%2Fkernel%2Fu-boot.git diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h index 5f05a48..2d897f8 100644 --- a/arch/x86/include/asm/mtrr.h +++ b/arch/x86/include/asm/mtrr.h @@ -1,107 +1,121 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (c) 2014 Google, Inc * * From Coreboot file of the same name - * - * SPDX-License-Identifier: GPL-2.0+ */ #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_CAP_SMRR (1 << 11) +#define MTRR_CAP_WC (1 << 10) +#define MTRR_CAP_FIX (1 << 8) +#define MTRR_CAP_VCNT_MASK 0xff + +#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 + +#define NUM_FIXED_MTRRS 11 +#define RANGES_PER_FIXED_MTRR 8 +#define NUM_FIXED_RANGES (NUM_FIXED_MTRRS * RANGES_PER_FIXED_MTRR) + +#define MTRR_FIX_64K_00000_MSR 0x250 +#define MTRR_FIX_16K_80000_MSR 0x258 +#define MTRR_FIX_16K_A0000_MSR 0x259 +#define MTRR_FIX_4K_C0000_MSR 0x268 +#define MTRR_FIX_4K_C8000_MSR 0x269 +#define MTRR_FIX_4K_D0000_MSR 0x26a +#define MTRR_FIX_4K_D8000_MSR 0x26b +#define MTRR_FIX_4K_E0000_MSR 0x26c +#define MTRR_FIX_4K_E8000_MSR 0x26d +#define MTRR_FIX_4K_F0000_MSR 0x26e +#define MTRR_FIX_4K_F8000_MSR 0x26f + +#define MTRR_FIX_TYPE(t) ((t << 24) | (t << 16) | (t << 8) | t) #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 + * @do_caches: true to disable caches before opening */ -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 */ +void mtrr_open(struct mtrr_state *state, bool do_caches); -#endif +/** + * 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() + * @state: true to restore cache state to that before mtrr_open() + */ +void mtrr_close(struct mtrr_state *state, bool do_caches); + +/** + * 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 + * + * @return: 0 on success, non-zero on failure + */ +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 + * + * @return: 0 on success, non-zero on failure + */ +int mtrr_commit(bool do_caches); -#if !defined(CONFIG_RAMTOP) -# error "CONFIG_RAMTOP not defined" #endif #if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0) @@ -114,8 +128,4 @@ static inline long x86_mtrr_rom_cache_var_index(void) { return -1; } #define CACHE_ROM_BASE (((1 << 20) - (CONFIG_CACHE_ROM_SIZE >> 12)) << 12) -#if (CONFIG_RAMTOP & (CONFIG_RAMTOP - 1)) != 0 -# error "CONFIG_RAMTOP must be a power of 2" -#endif - #endif