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#ifndef CPU_X86_MTRR_H
#define CPU_X86_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
#if !defined (__ASSEMBLER__) && !defined(__PRE_RAM__)
/*
* 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
* requirements 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 responsibility of the caller to enable it by calling
* x86_mtrr_enable_rom_caching().
*/
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
*/
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 */
#endif
#if !defined(__ASSEMBLER__) && defined(__PRE_RAM__) && !defined(__ROMCC__)
void set_var_mtrr(unsigned reg, unsigned base, unsigned size, unsigned type);
#endif
/* Align up to next power of 2, suitable for ROMCC and assembler too.
* Range of result 256kB to 128MB is good enough here.
*/
#define _POW2_MASK(x) ((x>>1)|(x>>2)|(x>>3)|(x>>4)|(x>>5)| \
(x>>6)|(x>>7)|(x>>8)|((1<<18)-1))
#define _ALIGN_UP_POW2(x) ((x + _POW2_MASK(x)) & ~_POW2_MASK(x))
#if !defined(CONFIG_RAMTOP)
# error "CONFIG_RAMTOP not defined"
#endif
#if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE -1)) != 0)
# error "CONFIG_XIP_ROM_SIZE is not a power of 2"
#endif
/* Select CACHE_ROM_SIZE to use with MTRR setup. For most cases this
* resolves to a suitable CONFIG_ROM_SIZE but some odd cases need to
* use CONFIG_CACHE_ROM_SIZE_OVERRIDE in the mainboard Kconfig.
*/
#if (CONFIG_CACHE_ROM_SIZE_OVERRIDE != 0)
# define CACHE_ROM_SIZE CONFIG_CACHE_ROM_SIZE_OVERRIDE
#else
# if ((CONFIG_ROM_SIZE & (CONFIG_ROM_SIZE-1)) == 0)
# define CACHE_ROM_SIZE CONFIG_ROM_SIZE
# else
# define CACHE_ROM_SIZE _ALIGN_UP_POW2(CONFIG_ROM_SIZE)
# if (CACHE_ROM_SIZE < CONFIG_ROM_SIZE) || (CACHE_ROM_SIZE >= (2 * CONFIG_ROM_SIZE))
# error "CACHE_ROM_SIZE is not optimal."
# endif
# endif
#endif
#if ((CACHE_ROM_SIZE & (CACHE_ROM_SIZE-1)) != 0)
# error "CACHE_ROM_SIZE is not a power of 2."
#endif
#define CACHE_ROM_BASE (((1<<20) - (CACHE_ROM_SIZE>>12))<<12)
#if (CONFIG_RAMTOP & (CONFIG_RAMTOP - 1)) != 0
# error "CONFIG_RAMTOP must be a power of 2"
#endif
#endif /* CPU_X86_MTRR_H */
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