Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

[pandora-kernel.git] / arch / arm / kernel / head.S

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 5365d4e..66db0a9 100644 (file)
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -16,37 +16,43 @@
 
 #include <asm/assembler.h>
 #include <asm/domain.h>
-#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>
 
-#define KERNEL_RAM_ADDR        (PAGE_OFFSET + TEXT_OFFSET)
+#if (PHYS_OFFSET & 0x001fffff)
+#error "PHYS_OFFSET must be at an even 2MiB boundary!"
+#endif
+
+#define KERNEL_RAM_VADDR       (PAGE_OFFSET + TEXT_OFFSET)
+#define KERNEL_RAM_PADDR       (PHYS_OFFSET + TEXT_OFFSET)
 
 /*
  * 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
+ * We place the page tables 16K below KERNEL_RAM_VADDR.  Therefore, we must
+ * make sure that KERNEL_RAM_VADDR 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.
+ * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
  */
-#if (KERNEL_RAM_ADDR & 0xffff) != 0x8000
-#error KERNEL_RAM_ADDR must start at 0xXXXX8000
+#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000
+#error KERNEL_RAM_VADDR must start at 0xXXXX8000
 #endif
 
        .globl  swapper_pg_dir
-       .equ    swapper_pg_dir, KERNEL_RAM_ADDR - 0x4000
+       .equ    swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000
 
        .macro  pgtbl, rd
-       ldr     \rd, =(__virt_to_phys(KERNEL_RAM_ADDR - 0x4000))
+       ldr     \rd, =(KERNEL_RAM_PADDR - 0x4000)
        .endm
 
 #ifdef CONFIG_XIP_KERNEL
-#define TEXTADDR  XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+#define KERNEL_START   XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+#define KERNEL_END     _edata_loc
 #else
-#define TEXTADDR  KERNEL_RAM_ADDR
+#define KERNEL_START   KERNEL_RAM_VADDR
+#define KERNEL_END     _end
 #endif
 
 /*
@@ -234,41 +240,42 @@ __create_page_tables:
 
        /*
         * Now setup the pagetables for our kernel direct
-        * mapped region.  We round TEXTADDR down to the
-        * nearest megabyte boundary.  It is assumed that
-        * the kernel fits within 4 contigous 1MB sections.
+        * mapped region.
         */
-       add     r0, r4,  #(TEXTADDR & 0xff000000) >> 18 @ start of kernel
-       str     r3, [r0, #(TEXTADDR & 0x00f00000) >> 18]!
-       add     r3, r3, #1 << 20
-       str     r3, [r0, #4]!                   @ KERNEL + 1MB
-       add     r3, r3, #1 << 20
-       str     r3, [r0, #4]!                   @ KERNEL + 2MB
+       add     r0, r4,  #(KERNEL_START & 0xff000000) >> 18
+       str     r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]!
+       ldr     r6, =(KERNEL_END - 1)
+       add     r0, r0, #4
+       add     r6, r4, r6, lsr #18
+1:     cmp     r0, r6
        add     r3, r3, #1 << 20
-       str     r3, [r0, #4]                    @ KERNEL + 3MB
+       strls   r3, [r0], #4
+       bls     1b
 
+#ifdef CONFIG_XIP_KERNEL
        /*
-        * Then map first 1MB of ram in case it contains our boot params.
+        * Map some ram to cover our .data and .bss areas.
         */
-       add     r0, r4, #PAGE_OFFSET >> 18
-       orr     r6, r7, #PHYS_OFFSET
-       str     r6, [r0]
+       orr     r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
+       orr     r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
+       add     r0, r4,  #(KERNEL_RAM_VADDR & 0xff000000) >> 18
+       str     r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
+       ldr     r6, =(_end - 1)
+       add     r0, r0, #4
+       add     r6, r4, r6, lsr #18
+1:     cmp     r0, r6
+       add     r3, r3, #1 << 20
+       strls   r3, [r0], #4
+       bls     1b
+#endif
 
-#ifdef CONFIG_XIP_KERNEL
        /*
-        * Map some ram to cover our .data and .bss areas.
-        * Mapping 3MB should be plenty.
+        * Then map first 1MB of ram in case it contains our boot params.
         */
-       sub     r3, r4, #PHYS_OFFSET
-       mov     r3, r3, lsr #20
-       add     r0, r0, r3, lsl #2
-       add     r6, r6, r3, lsl #20
-       str     r6, [r0], #4
-       add     r6, r6, #(1 << 20)
-       str     r6, [r0], #4
-       add     r6, r6, #(1 << 20)
+       add     r0, r4, #PAGE_OFFSET >> 18
+       orr     r6, r7, #(PHYS_OFFSET & 0xff000000)
+       orr     r6, r6, #(PHYS_OFFSET & 0x00e00000)
        str     r6, [r0]
-#endif
 
 #ifdef CONFIG_DEBUG_LL
        ldr     r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags