diff options
| -rw-r--r-- | arch/x86/cpu/cpu.c | 35 | ||||
| -rw-r--r-- | arch/x86/include/asm/cpu.h | 22 | ||||
| -rw-r--r-- | arch/x86/lib/physmem.c | 33 |
3 files changed, 60 insertions, 30 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c index 623e3af..7a4de29 100644 --- a/arch/x86/cpu/cpu.c +++ b/arch/x86/cpu/cpu.c @@ -240,3 +240,38 @@ int icache_status(void) { return 1; } + +void cpu_enable_paging_pae(ulong cr3) +{ + __asm__ __volatile__( + /* Load the page table address */ + "movl %0, %%cr3\n" + /* Enable pae */ + "movl %%cr4, %%eax\n" + "orl $0x00000020, %%eax\n" + "movl %%eax, %%cr4\n" + /* Enable paging */ + "movl %%cr0, %%eax\n" + "orl $0x80000000, %%eax\n" + "movl %%eax, %%cr0\n" + : + : "r" (cr3) + : "eax"); +} + +void cpu_disable_paging_pae(void) +{ + /* Turn off paging */ + __asm__ __volatile__ ( + /* Disable paging */ + "movl %%cr0, %%eax\n" + "andl $0x7fffffff, %%eax\n" + "movl %%eax, %%cr0\n" + /* Disable pae */ + "movl %%cr4, %%eax\n" + "andl $0xffffffdf, %%eax\n" + "movl %%eax, %%cr4\n" + : + : + : "eax"); +} diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h new file mode 100644 index 0000000..2938087 --- /dev/null +++ b/arch/x86/include/asm/cpu.h @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2014 The Chromium OS Authors. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __X86_CPU_H +#define __X86_CPU_H + + /** + * cpu_enable_paging_pae() - Enable PAE-paging + * + * @pdpt: Value to set in cr3 (PDPT or PML4T) + */ +void cpu_enable_paging_pae(ulong cr3); + +/** + * cpu_disable_paging_pae() - Disable paging and PAE + */ +void cpu_disable_paging_pae(void); + +#endif diff --git a/arch/x86/lib/physmem.c b/arch/x86/lib/physmem.c index b57b2c3..c3c709e 100644 --- a/arch/x86/lib/physmem.c +++ b/arch/x86/lib/physmem.c @@ -10,6 +10,7 @@ #include <common.h> #include <physmem.h> +#include <asm/cpu.h> #include <linux/compiler.h> DECLARE_GLOBAL_DATA_PTR; @@ -112,41 +113,13 @@ static void x86_phys_enter_paging(void) x86_phys_map_page(page_addr, page_addr, 0); } - /* Turn on paging */ - __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" (pdpt) - : "eax" - ); + cpu_enable_paging_pae((ulong)pdpt); } /* Disable paging and PAE mode. */ static void x86_phys_exit_paging(void) { - /* Turn off paging */ - __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" - ); + cpu_disable_paging_pae(); } /* |