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authorSimon Glass <sjg@chromium.org>2013-02-28 19:26:10 +0000
committerSimon Glass <sjg@chromium.org>2013-03-04 15:56:46 -0800
commit5e98947f9baa5bdc9b819d365f9f8ef65a9b1e4d (patch)
tree3837fd16321542d20d654442752b419d84514709 /arch/x86/lib
parent2536850d7cd90bdb75bf3ff86838f913392b68db (diff)
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x86: Add function to get top of usable ram
The memory layout calculations are done in calculate_relocation_address(), and coreboot has its own version of this function. But in fact all we really need is to set the top of usable RAM, and then the base version will work as is. So instead of allowing the whole calculate_relocation_address() function to be replaced, create board_get_usable_ram_top() which can be used by a board to specify the top of the area where U-Boot relocations to. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/init_helpers.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c
index 3eec9a6..1a097f1 100644
--- a/arch/x86/lib/init_helpers.c
+++ b/arch/x86/lib/init_helpers.c
@@ -73,26 +73,34 @@ int init_baudrate_f(void)
return 0;
}
-__weak int calculate_relocation_address(void)
+/* Get the top of usable RAM */
+__weak ulong board_get_usable_ram_top(ulong total_size)
{
- ulong text_start = (ulong)&__text_start;
- ulong bss_end = (ulong)&__bss_end;
+ return gd->ram_size;
+}
+
+int calculate_relocation_address(void)
+{
+ const ulong uboot_size = (uintptr_t)&__bss_end -
+ (uintptr_t)&__text_start;
+ ulong total_size;
ulong dest_addr;
+ total_size = ALIGN(uboot_size, 1 << 12) + CONFIG_SYS_MALLOC_LEN +
+ CONFIG_SYS_STACK_SIZE;
+
/*
* NOTE: All destination address are rounded down to 16-byte
* boundary to satisfy various worst-case alignment
* requirements
*/
+ dest_addr = board_get_usable_ram_top(total_size);
- /* Stack is at top of available memory */
- dest_addr = gd->ram_size;
-
- /* U-Boot is at the top */
- dest_addr -= (bss_end - text_start);
- dest_addr &= ~15;
+ /* U-Boot is below the FDT */
+ dest_addr -= uboot_size;
+ dest_addr &= ~((1 << 12) - 1);
gd->relocaddr = dest_addr;
- gd->reloc_off = (dest_addr - text_start);
+ gd->reloc_off = dest_addr - (uintptr_t)&__text_start;
/* Stack is at the bottom, so it can grow down */
gd->start_addr_sp = dest_addr - CONFIG_SYS_MALLOC_LEN;