I want to use setup_data fields of linux boot header, but grub doesn'tsupport
it. So, I cone latest grub repo (1.99) and modify grub code asfollows:
1. in include/grub/i386/linux.h,
struct linux_kernel_header {@@ -130,6 +144,8 @@ grub_uint16_t pad1;
/* Unused */ grub_uint32_t cmd_line_ptr; /*
Points to the kernel command line */ grub_uint32_t initrd_addr_max; /*
Highest address for initrd */+ grub_uint32_t pad2[8];+ grub_uint64_t
new_field; <-------------- aligned to the offset : 0x250 as linux }
__attribute__ ((packed));
2. grub-core/loader/i386/linux.c
I add a command by following "initrd", but simply as follows:
static grub_err_t grub_cmd_test(cmd, argc, argv[]) {
grub_printf("entering my test command\n");
... //ensure kernel is loaded struct
linux_kernel_header *lh = (struct linux_kernel_header *) real_mode_mem;
lh->new_field = 0x34FFFFFF; } when I boot GRUB with my
command, GRUB panic in relocator. I print the kernelheader, seems the header
is there ( I mean real_mode_mem). If I removed the line"lh->new_field =
0x34FFFFFF", GRUB can work.
Did I miss something if I want pass this field into linux kernel ?
thanks,-minskey
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