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#include <cpu/k8/mtrr.h>
/* The fixed and variable MTRRs are powered-up with random values, clear them to
* MTRR_TYPE_UNCACHABLE for safty reason
*/
earlymtrr_start:
xorl %eax, %eax # clear %eax and %edx
xorl %edx, %edx #
movl $fixed_mtrr_msr, %esi
clear_fixed_var_mtrr:
lodsl (%esi), %eax
testl %eax, %eax
jz clear_fixed_var_mtrr_out
movl %eax, %ecx
xorl %eax, %eax
wrmsr
jmp clear_fixed_var_mtrr
clear_fixed_var_mtrr_out:
/* enable memory access for 0 - 8MB using top_mem */
movl $TOP_MEM, %ecx
xorl %edx, %edx
movl $0x0800000, %eax
wrmsr
set_var_mtrr:
/* enable caching for 0 - 128MB using variable mtrr */
movl $0x200, %ecx
rdmsr
andl $0xfffffff0, %edx
orl $0x00000000, %edx
andl $0x00000f00, %eax
orl $0x00000006, %eax
wrmsr
movl $0x201, %ecx
rdmsr
andl $0xfffffff0, %edx
orl $0x0000000f, %edx
andl $0x000007ff, %eax
orl $0xf0000800, %eax
wrmsr
#if defined(XIP_ROM_SIZE) && defined(XIP_ROM_BASE)
/* enable write back cachine so we can do execute in place
* on the flash rom.
*/
movl $0x202, %ecx
xorl %edx, %edx
movl $(XIP_ROM_BASE | 0x006), %eax
wrmsr
movl $0x203, %ecx
movl $0x0000000f, %edx
movl $(~(XIP_ROM_SIZE - 1) | 0x800), %eax
wrmsr
#endif /* XIP_ROM_SIZE && XIP_ROM_BASE */
enable_mtrr:
/* Set the default memory type and enable fixed and variable MTRRs */
movl $0x2ff, %ecx
xorl %edx, %edx
/* Enable Variable MTRRs */
movl $0x00000800, %eax
wrmsr
/* Enable the MTRRs in SYSCFG */
movl $SYSCFG_MSR, %ecx
rdmsr
orl $(SYSCFG_MSR_MtrrVarDramEn), %eax
wrmsr
/* enable cache */
movl %cr0, %eax
andl $0x9fffffff,%eax
movl %eax, %cr0
jmp earlymtrr_end
fixed_mtrr_msr:
.long 0x250, 0x258, 0x259
.long 0x268, 0x269, 0x26A
.long 0x26B, 0x26C, 0x26D
.long 0x26E, 0x26F
var_mtrr_msr:
.long 0x200, 0x201, 0x202, 0x203
.long 0x204, 0x205, 0x206, 0x207
.long 0x208, 0x209, 0x20A, 0x20B
.long 0x20C, 0x20D, 0x20E, 0x20F
var_iorr_msr:
.long 0xC0010016, 0xC0010017, 0xC0010018, 0xC0010019
mem_top:
.long 0xC001001A, 0xC001001D
.long 0x000 /* NULL, end of table */
earlymtrr_end:
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