Hi Bin,
On 20 April 2015 at 22:21, Bin Meng <bmeng...@gmail.com> wrote:
> Create a default e820 table with 3 entries which is enough to boot
> a Linux kernel.
>
> Signed-off-by: Bin Meng <bmeng...@gmail.com>
> ---
>
> arch/x86/lib/zimage.c | 29 ++++++++++++++++++++++-------
> 1 file changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
> index 566b048..c3f8a73 100644
> --- a/arch/x86/lib/zimage.c
> +++ b/arch/x86/lib/zimage.c
> @@ -25,6 +25,8 @@
> #endif
> #include <linux/compiler.h>
>
> +DECLARE_GLOBAL_DATA_PTR;
> +
> /*
> * Memory lay-out:
> *
> @@ -40,16 +42,29 @@
>
> #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;
> +
> + return 3;
> }
>
> -unsigned install_e820_map(unsigned max_entries,
> - struct e820entry *entries)
> - __attribute__((weak, alias("generic_install_e820_map")));
> -
> static void build_command_line(char *command_line, int auto_boot)
> {
> char *env_command_line;
> --
> 1.8.2.1
>
Why is this code sitting in zimage.c? Should it be used with bootm also?
Regards,
Simon
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