#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 base caching 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: