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-rw-r--r--arch/arm/kernel/head.S59
1 files changed, 23 insertions, 36 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 835898e..3db960e 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -55,14 +55,6 @@
add \rd, \phys, #TEXT_OFFSET - PG_DIR_SIZE
.endm
-#ifdef CONFIG_XIP_KERNEL
-#define KERNEL_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
-#define KERNEL_END _edata_loc
-#else
-#define KERNEL_START KERNEL_RAM_VADDR
-#define KERNEL_END _end
-#endif
-
/*
* Kernel startup entry point.
* ---------------------------
@@ -218,51 +210,46 @@ __create_page_tables:
blo 1b
/*
- * Now setup the pagetables for our kernel direct
- * mapped region.
+ * Map our RAM from the start to the end of the kernel .bss section.
*/
- mov r3, pc
- mov r3, r3, lsr #SECTION_SHIFT
- orr r3, r7, r3, lsl #SECTION_SHIFT
- add r0, r4, #(KERNEL_START & 0xff000000) >> (SECTION_SHIFT - PMD_ORDER)
- str r3, [r0, #((KERNEL_START & 0x00f00000) >> SECTION_SHIFT) << PMD_ORDER]!
- ldr r6, =(KERNEL_END - 1)
- add r0, r0, #1 << PMD_ORDER
+ add r0, r4, #PAGE_OFFSET >> (SECTION_SHIFT - PMD_ORDER)
+ ldr r6, =(_end - 1)
+ orr r3, r8, r7
add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER)
-1: cmp r0, r6
+1: str r3, [r0], #1 << PMD_ORDER
add r3, r3, #1 << SECTION_SHIFT
- strls r3, [r0], #1 << PMD_ORDER
+ cmp r0, r6
bls 1b
#ifdef CONFIG_XIP_KERNEL
/*
- * Map some ram to cover our .data and .bss areas.
+ * Map the kernel image separately as it is not located in RAM.
*/
- add r3, r8, #TEXT_OFFSET
- orr r3, r3, r7
- add r0, r4, #(KERNEL_RAM_VADDR & 0xff000000) >> (SECTION_SHIFT - PMD_ORDER)
- str r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> (SECTION_SHIFT - PMD_ORDER)]!
- ldr r6, =(_end - 1)
- add r0, r0, #4
+#define XIP_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+ mov r3, pc
+ mov r3, r3, lsr #SECTION_SHIFT
+ orr r3, r7, r3, lsl #SECTION_SHIFT
+ add r0, r4, #(XIP_START & 0xff000000) >> (SECTION_SHIFT - PMD_ORDER)
+ str r3, [r0, #((XIP_START & 0x00f00000) >> SECTION_SHIFT) << PMD_ORDER]!
+ ldr r6, =(_edata_loc - 1)
+ add r0, r0, #1 << PMD_ORDER
add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER)
1: cmp r0, r6
- add r3, r3, #1 << 20
- strls r3, [r0], #4
+ add r3, r3, #1 << SECTION_SHIFT
+ strls r3, [r0], #1 << PMD_ORDER
bls 1b
#endif
/*
- * Then map boot params address in r2 or the first 1MB (2MB with LPAE)
- * of ram if boot params address is not specified.
+ * Then map boot params address in r2 if specified.
*/
mov r0, r2, lsr #SECTION_SHIFT
movs r0, r0, lsl #SECTION_SHIFT
- moveq r0, r8
- sub r3, r0, r8
- add r3, r3, #PAGE_OFFSET
- add r3, r4, r3, lsr #(SECTION_SHIFT - PMD_ORDER)
- orr r6, r7, r0
- str r6, [r3]
+ subne r3, r0, r8
+ addne r3, r3, #PAGE_OFFSET
+ addne r3, r4, r3, lsr #(SECTION_SHIFT - PMD_ORDER)
+ orrne r6, r7, r0
+ strne r6, [r3]
#ifdef CONFIG_DEBUG_LL
#if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING)