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#ifndef EARLYMTRR_C
#define EARLYMTRR_C
#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
/* Validate XIP_ROM_SIZE and XIP_ROM_BASE */
#if defined(XIP_ROM_SIZE) && !defined(XIP_ROM_BASE)
# error "XIP_ROM_SIZE without XIP_ROM_BASE"
#endif
#if defined(XIP_ROM_BASE) && !defined(XIP_ROM_SIZE)
# error "XIP_ROM_BASE without XIP_ROM_SIZE"
#endif
#if !defined(CONFIG_LB_MEM_TOPK)
# error "CONFIG_LB_MEM_TOPK not defined"
#endif
#if defined(XIP_ROM_SIZE) && ((XIP_ROM_SIZE & (XIP_ROM_SIZE -1)) != 0)
# error "XIP_ROM_SIZE is not a power of 2"
#endif
#if defined(XIP_ROM_SIZE) && ((XIP_ROM_BASE % XIP_ROM_SIZE) != 0)
# error "XIP_ROM_BASE is not a multiple of XIP_ROM_SIZE"
#endif
#if (CONFIG_LB_MEM_TOPK & (CONFIG_LB_MEM_TOPK -1)) != 0
# error "CONFIG_LB_MEM_TOPK must be a power of 2"
#endif
static void disable_var_mtrr(unsigned reg)
{
/* The invalid bit is kept in the mask so we simply
* clear the relevent mask register to disable a
* range.
*/
msr_t zero;
zero.lo = zero.hi = 0;
wrmsr(MTRRphysMask_MSR(reg), zero);
}
static void set_var_mtrr(
unsigned reg, unsigned base, unsigned size, unsigned type)
{
/* Bit Bit 32-35 of MTRRphysMask should be set to 1 */
msr_t basem, maskm;
basem.lo = base | type;
basem.hi = 0;
wrmsr(MTRRphysBase_MSR(reg), basem);
maskm.lo = ~(size - 1) | 0x800;
maskm.hi = 0x0f;
wrmsr(MTRRphysMask_MSR(reg), maskm);
}
static void cache_lbmem(int type)
{
/* Enable caching for 0 - 1MB using variable mtrr */
disable_cache();
set_var_mtrr(0, 0x00000000, CONFIG_LB_MEM_TOPK << 10, type);
enable_cache();
}
/* the fixed and variable MTTRs are power-up with random values,
* clear them to MTRR_TYPE_UNCACHEABLE for safty.
*/
static void do_early_mtrr_init(const unsigned long *mtrr_msrs)
{
/* Precondition:
* The cache is not enabled in cr0 nor in MTRRdefType_MSR
* entry32.inc ensures the cache is not enabled in cr0
*/
msr_t msr;
const unsigned long *msr_addr;
unsigned long cr0;
/* Inialize all of the relevant msrs to 0 */
msr.lo = 0;
msr.hi = 0;
unsigned long msr_nr;
for(msr_addr = mtrr_msrs; (msr_nr = *msr_addr); msr_addr++) {
wrmsr(msr_nr, msr);
}
#if defined(XIP_ROM_SIZE)
/* enable write through caching so we can do execute in place
* on the flash rom.
*/
set_var_mtrr(1, XIP_ROM_BASE, XIP_ROM_SIZE, MTRR_TYPE_WRBACK);
#endif
/* Set the default memory type and enable fixed and variable MTRRs
*/
/* Enable Variable MTRRs */
msr.hi = 0x00000000;
msr.lo = 0x00000800;
wrmsr(MTRRdefType_MSR, msr);
}
static void early_mtrr_init(void)
{
static const unsigned long mtrr_msrs[] = {
/* fixed mtrr */
0x250, 0x258, 0x259,
0x268, 0x269, 0x26A,
0x26B, 0x26C, 0x26D,
0x26E, 0x26F,
/* var mtrr */
0x200, 0x201, 0x202, 0x203,
0x204, 0x205, 0x206, 0x207,
0x208, 0x209, 0x20A, 0x20B,
0x20C, 0x20D, 0x20E, 0x20F,
/* NULL end of table */
0
};
disable_cache();
do_early_mtrr_init(mtrr_msrs);
enable_cache();
}
static int early_mtrr_init_detected(void)
{
msr_t msr;
/* See if MTRR's are enabled.
* a #RESET disables them while an #INIT
* preserves their state. This works
* on both Intel and AMD cpus, at least
* according to the documentation.
*/
msr = rdmsr(MTRRdefType_MSR);
return msr.lo & 0x00000800;
}
#endif /* EARLYMTRR_C */
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