diff options
Diffstat (limited to 'arch/arm/kernel/head.S')
| -rw-r--r-- | arch/arm/kernel/head.S | 57 |
1 files changed, 17 insertions, 40 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 5396263..8d87484 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] |