diff options
Diffstat (limited to 'fw_cfg.c')
| -rw-r--r-- | fw_cfg.c | 45 |
1 files changed, 45 insertions, 0 deletions
@@ -1,7 +1,9 @@ #include "bios.h" +#include "stdio.h" #include "ioport.h" #include "string.h" #include "fw_cfg.h" +#include "linuxboot.h" struct fw_cfg_file { uint32_t size; @@ -48,3 +50,46 @@ void fw_cfg_file_select(int id) { fw_cfg_select(files[id].select); } + +void boot_from_fwcfg(void) +{ + struct linuxboot_args args; + uint32_t kernel_size; + + fw_cfg_select(FW_CFG_CMDLINE_SIZE); + args.cmdline_size = fw_cfg_readl_le(); + fw_cfg_select(FW_CFG_INITRD_SIZE); + args.initrd_size = fw_cfg_readl_le(); + + /* QEMU has already split the real mode and protected mode + * parts. Recombine them in args.vmlinuz_size. + */ + fw_cfg_select(FW_CFG_KERNEL_SIZE); + kernel_size = fw_cfg_readl_le(); + fw_cfg_select(FW_CFG_SETUP_SIZE); + args.vmlinuz_size = kernel_size + fw_cfg_readl_le(); + + fw_cfg_select(FW_CFG_SETUP_DATA); + fw_cfg_read(args.header, sizeof(args.header)); + + if (!parse_bzimage(&args)) + return; + + /* SETUP_DATA already selected */ + if (args.setup_size > sizeof(args.header)) + fw_cfg_read(args.setup_addr + sizeof(args.header), + args.setup_size - sizeof(args.header)); + + fw_cfg_select(FW_CFG_KERNEL_DATA); + fw_cfg_read(args.kernel_addr, kernel_size); + + fw_cfg_select(FW_CFG_CMDLINE_DATA); + fw_cfg_read(args.cmdline_addr, args.cmdline_size); + + if (args.initrd_size) { + fw_cfg_select(FW_CFG_INITRD_DATA); + fw_cfg_read(args.initrd_addr, args.initrd_size); + } + + boot_bzimage(&args); +} |