diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cpu/x86/pae/pgtbl.c | 70 | ||||
| -rw-r--r-- | src/include/cpu/x86/pae.h | 8 |
2 files changed, 45 insertions, 33 deletions
diff --git a/src/cpu/x86/pae/pgtbl.c b/src/cpu/x86/pae/pgtbl.c index 063c9aba38..fe7705f4d0 100644 --- a/src/cpu/x86/pae/pgtbl.c +++ b/src/cpu/x86/pae/pgtbl.c @@ -17,48 +17,52 @@ #include <console/console.h> #include <cpu/cpu.h> #include <arch/cpu.h> +#include <cpu/x86/cr.h> #include <cpu/x86/msr.h> #include <cpu/x86/pae.h> #include <rules.h> #include <string.h> -#if ENV_RAMSTAGE -static void paging_off(void) +void paging_enable_pae_cr3(uintptr_t cr3) { - __asm__ __volatile__ ( - /* Disable paging */ - "movl %%cr0, %%eax\n\t" - "andl $0x7FFFFFFF, %%eax\n\t" - "movl %%eax, %%cr0\n\t" - /* Disable pae */ - "movl %%cr4, %%eax\n\t" - "andl $0xFFFFFFDF, %%eax\n\t" - "movl %%eax, %%cr4\n\t" - : - : - : "eax" - ); + /* Load the page table address */ + write_cr3(cr3); + paging_enable_pae(); } -static void paging_on(void *pdp) +void paging_enable_pae(void) { - __asm__ __volatile__( - /* Load the page table address */ - "movl %0, %%cr3\n\t" - /* Enable pae */ - "movl %%cr4, %%eax\n\t" - "orl $0x00000020, %%eax\n\t" - "movl %%eax, %%cr4\n\t" - /* Enable paging */ - "movl %%cr0, %%eax\n\t" - "orl $0x80000000, %%eax\n\t" - "movl %%eax, %%cr0\n\t" - : - : "r" (pdp) - : "eax" - ); + CRx_TYPE cr0; + CRx_TYPE cr4; + + /* Enable PAE */ + cr4 = read_cr4(); + cr4 |= CR4_PAE; + write_cr4(cr4); + + /* Enable Paging */ + cr0 = read_cr0(); + cr0 |= CR0_PG; + write_cr0(cr0); } +void paging_disable_pae(void) +{ + CRx_TYPE cr0; + CRx_TYPE cr4; + + /* Disable Paging */ + cr0 = read_cr0(); + cr0 &= ~(CRx_TYPE)CR0_PG; + write_cr0(cr0); + + /* Disable PAE */ + cr4 = read_cr4(); + cr4 &= ~(CRx_TYPE)CR4_PAE; + write_cr4(cr4); +} + +#if ENV_RAMSTAGE void *map_2M_page(unsigned long page) { struct pde { @@ -82,7 +86,7 @@ void *map_2M_page(unsigned long page) return MAPPING_ERROR; window = page >> 10; if (window != mapped_window[index]) { - paging_off(); + paging_disable_pae(); if (window > 1) { struct pde *pd, *pdp; /* Point the page directory pointers at the page @@ -109,7 +113,7 @@ void *map_2M_page(unsigned long page) | ((i & 0x3ff) << 21) | 0xE3; pd[i].addr_hi = (window >> 1); } - paging_on(pdp); + paging_enable_pae_cr3((uintptr_t)pdp); } mapped_window[index] = window; } diff --git a/src/include/cpu/x86/pae.h b/src/include/cpu/x86/pae.h index 9b9f27b688..5bbfdf3aca 100644 --- a/src/include/cpu/x86/pae.h +++ b/src/include/cpu/x86/pae.h @@ -3,6 +3,14 @@ #include <stdint.h> +/* Enable paging with cr3 value for page directory pointer table as well as PAE + option in cr4. */ +void paging_enable_pae_cr3(uintptr_t cr3); +/* Enable paging as well as PAE option in cr4. */ +void paging_enable_pae(void); +/* Disable paging as well as PAE option in cr4. */ +void paging_disable_pae(void); + /* Set/Clear NXE bit in IA32_EFER MSR */ void paging_set_nxe(int enable); |