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authorGabe Black <gabeblack@chromium.org>2012-12-03 14:26:08 +0000
committerSimon Glass <sjg@chromium.org>2012-12-06 14:30:42 -0800
commit112a575e498fe0c6bfbb4dbe3266d83f48d46a99 (patch)
tree36e2ec96b1c57cdf8c8cbf1dd9fd8bbfc45b0f89 /arch/x86/cpu
parentd65297b64d743105b18d912fa62627d6bf468c2f (diff)
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x86: Override calculate_relocation_address to use the e820 map
Because calculate_relocation_address now uses the e820 map, it will be able to avoid addresses over 32 bits and regions that are at high addresses but not big enough for U-Boot. It also means we can remove the hack which limitted U-Boot's idea of the size of memory to less than 4GB. Also take into account the space needed for the heap and stack, so we avoid picking a very small region those areas might overlap with something it shouldn't. Signed-off-by: Gabe Black <gabeblack@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/cpu')
-rw-r--r--arch/x86/cpu/coreboot/sdram.c61
1 files changed, 55 insertions, 6 deletions
diff --git a/arch/x86/cpu/coreboot/sdram.c b/arch/x86/cpu/coreboot/sdram.c
index 5d3da99..76274cb 100644
--- a/arch/x86/cpu/coreboot/sdram.c
+++ b/arch/x86/cpu/coreboot/sdram.c
@@ -27,8 +27,9 @@
#include <asm/e820.h>
#include <asm/u-boot-x86.h>
#include <asm/global_data.h>
-#include <asm/arch-coreboot/sysinfo.h>
-#include <asm/arch-coreboot/tables.h>
+#include <asm/processor.h>
+#include <asm/arch/sysinfo.h>
+#include <asm/arch/tables.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -51,6 +52,58 @@ unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
return num_entries;
}
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
+ * overrides the default implementation found elsewhere which simply picks the
+ * end of ram, wherever that may be. The location of the stack, the relocation
+ * address, and how far U-Boot is moved by relocation are set in the global
+ * data structure.
+ */
+int calculate_relocation_address(void)
+{
+ const uint64_t uboot_size = (uintptr_t)&__bss_end -
+ (uintptr_t)&__text_start;
+ const uint64_t total_size = uboot_size + CONFIG_SYS_MALLOC_LEN +
+ CONFIG_SYS_STACK_SIZE;
+ uintptr_t dest_addr = 0;
+ int i;
+
+ for (i = 0; i < lib_sysinfo.n_memranges; i++) {
+ struct memrange *memrange = &lib_sysinfo.memrange[i];
+ /* Force U-Boot to relocate to a page aligned address. */
+ uint64_t start = roundup(memrange->base, 1 << 12);
+ uint64_t end = memrange->base + memrange->size;
+
+ /* Ignore non-memory regions. */
+ if (memrange->type != CB_MEM_RAM)
+ continue;
+
+ /* Filter memory over 4GB. */
+ if (end > 0xffffffffULL)
+ end = 0x100000000ULL;
+ /* Skip this region if it's too small. */
+ if (end - start < total_size)
+ continue;
+
+ /* Use this address if it's the largest so far. */
+ if (end - uboot_size > dest_addr)
+ dest_addr = end;
+ }
+
+ /* If no suitable area was found, return an error. */
+ if (!dest_addr)
+ return 1;
+
+ dest_addr -= uboot_size;
+ dest_addr &= ~((1 << 12) - 1);
+ gd->relocaddr = dest_addr;
+ gd->reloc_off = dest_addr - (uintptr_t)&__text_start;
+ gd->start_addr_sp = dest_addr - CONFIG_SYS_MALLOC_LEN;
+
+ return 0;
+}
+
int dram_init_f(void)
{
int i;
@@ -60,10 +113,6 @@ int dram_init_f(void)
struct memrange *memrange = &lib_sysinfo.memrange[i];
unsigned long long end = memrange->base + memrange->size;
- /* Ignore memory over 4GB, we can't use it. */
- if (memrange->base > 0xffffffff)
- continue;
-
if (memrange->type == CB_MEM_RAM && end > ram_size)
ram_size = end;
}