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-rw-r--r--arch/arm/kernel/head.S57
1 files changed, 17 insertions, 40 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 53962635134..8d8748407cb 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -21,6 +21,7 @@
#include <asm/procinfo.h>
#include <asm/ptrace.h>
#include <asm/asm-offsets.h>
+#include <asm/memory.h>
#include <asm/thread_info.h>
#include <asm/system.h>
@@ -33,52 +34,28 @@
#define MACHINFO_PGOFFIO 12
#define MACHINFO_NAME 16
-#ifndef CONFIG_XIP_KERNEL
/*
- * We place the page tables 16K below TEXTADDR. Therefore, we must make sure
- * that TEXTADDR is correctly set. Currently, we expect the least significant
- * 16 bits to be 0x8000, but we could probably relax this restriction to
- * TEXTADDR >= PAGE_OFFSET + 0x4000
- *
- * Note that swapper_pg_dir is the virtual address of the page tables, and
- * pgtbl gives us a position-independent reference to these tables. We can
- * do this because stext == TEXTADDR
+ * swapper_pg_dir is the virtual address of the initial page table.
+ * We place the page tables 16K below KERNEL_RAM_ADDR. Therefore, we must
+ * make sure that KERNEL_RAM_ADDR is correctly set. Currently, we expect
+ * the least significant 16 bits to be 0x8000, but we could probably
+ * relax this restriction to KERNEL_RAM_ADDR >= PAGE_OFFSET + 0x4000.
*/
-#if (TEXTADDR & 0xffff) != 0x8000
-#error TEXTADDR must start at 0xXXXX8000
+#if (KERNEL_RAM_ADDR & 0xffff) != 0x8000
+#error KERNEL_RAM_ADDR must start at 0xXXXX8000
#endif
.globl swapper_pg_dir
- .equ swapper_pg_dir, TEXTADDR - 0x4000
+ .equ swapper_pg_dir, KERNEL_RAM_ADDR - 0x4000
- .macro pgtbl, rd, phys
- adr \rd, stext
- sub \rd, \rd, #0x4000
+ .macro pgtbl, rd
+ ldr \rd, =(__virt_to_phys(KERNEL_RAM_ADDR - 0x4000))
.endm
-#else
-/*
- * XIP Kernel:
- *
- * We place the page tables 16K below DATAADDR. Therefore, we must make sure
- * that DATAADDR is correctly set. Currently, we expect the least significant
- * 16 bits to be 0x8000, but we could probably relax this restriction to
- * DATAADDR >= PAGE_OFFSET + 0x4000
- *
- * Note that pgtbl is meant to return the physical address of swapper_pg_dir.
- * We can't make it relative to the kernel position in this case since
- * the kernel can physically be anywhere.
- */
-#if (DATAADDR & 0xffff) != 0x8000
-#error DATAADDR must start at 0xXXXX8000
-#endif
-
- .globl swapper_pg_dir
- .equ swapper_pg_dir, DATAADDR - 0x4000
- .macro pgtbl, rd, phys
- ldr \rd, =((DATAADDR - 0x4000) - VIRT_OFFSET)
- add \rd, \rd, \phys
- .endm
+#ifdef CONFIG_XIP_KERNEL
+#define TEXTADDR XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+#else
+#define TEXTADDR KERNEL_RAM_ADDR
#endif
/*
@@ -279,7 +256,7 @@ __turn_mmu_on:
.type __create_page_tables, %function
__create_page_tables:
ldr r5, [r8, #MACHINFO_PHYSRAM] @ physram
- pgtbl r4, r5 @ page table address
+ pgtbl r4 @ page table address
/*
* Clear the 16K level 1 swapper page table
@@ -324,7 +301,7 @@ __create_page_tables:
/*
* Then map first 1MB of ram in case it contains our boot params.
*/
- add r0, r4, #VIRT_OFFSET >> 18
+ add r0, r4, #PAGE_OFFSET >> 18
orr r6, r5, r7
str r6, [r0]