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x86: Install a default e820 table in the __weak install_e820_map()

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Create a default e820 table with 3 entries which is enough to boot
a Linux kernel.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-04-21 12:21:36 +08:00 committed by Simon Glass
parent 24ff8e70e1
commit 54c6001bba
1 changed files with 22 additions and 7 deletions
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29
arch/x86/lib/zimage.c
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@ -25,6 +25,8 @@
#endif
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Memory lay-out:
*
@ -40,15 +42,28 @@
#define COMMAND_LINE_SIZE 2048
unsigned generic_install_e820_map(unsigned max_entries,
struct e820entry *entries)
/*
* Install a default e820 table with 3 entries as follows:
*
* 0x000000-0x0a0000 Useable RAM
* 0x0a0000-0x100000 Reserved for ISA
* 0x100000-gd->ram_size Useable RAM
*/
__weak unsigned install_e820_map(unsigned max_entries,
struct e820entry *entries)
{
return 0;
}
entries[0].addr = 0;
entries[0].size = ISA_START_ADDRESS;
entries[0].type = E820_RAM;
entries[1].addr = ISA_START_ADDRESS;
entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
entries[1].type = E820_RESERVED;
entries[2].addr = ISA_END_ADDRESS;
entries[2].size = gd->ram_size - ISA_END_ADDRESS;
entries[2].type = E820_RAM;
unsigned install_e820_map(unsigned max_entries,
struct e820entry *entries)
__attribute__((weak, alias("generic_install_e820_map")));
return 3;
}
static void build_command_line(char *command_line, int auto_boot)
{