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-rw-r--r--arch/x86/cpu/cpu.c35
-rw-r--r--arch/x86/include/asm/cpu.h22
-rw-r--r--arch/x86/lib/physmem.c33
3 files changed, 60 insertions, 30 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 623e3af61f..7a4de29824 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 0000000000..2938087cc1
--- /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 b57b2c30fe..c3c709ec07 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();
}
/*
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