From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S | 236 +++++++++++++++++++++++ 1 file changed, 236 insertions(+) create mode 100644 qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S (limited to 'qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S') diff --git a/qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S b/qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S new file mode 100644 index 000000000..259bc6ba5 --- /dev/null +++ b/qemu/roms/ipxe/src/arch/i386/prefix/lkrnprefix.S @@ -0,0 +1,236 @@ +FILE_LICENCE ( GPL_ANY ) + +#define BZI_LOAD_HIGH_ADDR 0x100000 + + .text + .arch i386 + .code16 + .section ".prefix", "ax", @progbits + .globl _lkrn_start +_lkrn_start: + +/***************************************************************************** + * + * Kernel header + * + * We place our prefix (i.e. our .prefix and .text16.early sections) + * within the bzImage real-mode portion which gets loaded at + * 1000:0000, and our payload (i.e. everything else) within the + * bzImage protected-mode portion which gets loaded at 0x100000 + * upwards. + * + */ + + .org 0x1f1 +setup_sects: + .byte -1 /* Allow for initial "boot sector" */ + .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ + .ascii "ADHL" + .long setup_sects + .long 512 + .long 0 + .previous +root_flags: + .word 0 +syssize: + .long 0 + .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ + .ascii "ADPL" + .long syssize + .long 16 + .long 0 + .previous +ram_size: + .word 0 +vid_mode: + .word 0 +root_dev: + .word 0 +boot_flag: + .word 0xaa55 +jump: + /* Manually specify a two-byte jmp instruction here rather + * than leaving it up to the assembler. + */ + .byte 0xeb, ( setup - header ) +header: + .byte 'H', 'd', 'r', 'S' +version: + .word 0x0207 /* 2.07 */ +realmode_swtch: + .long 0 +start_sys: + .word 0 +kernel_version: + .word version_string - 0x200 +type_of_loader: + .byte 0 +loadflags: + .byte 0x01 /* LOADED_HIGH */ +setup_move_size: + .word 0 +code32_start: + .long 0 +ramdisk_image: + .long 0 +ramdisk_size: + .long 0 +bootsect_kludge: + .long 0 +heap_end_ptr: + .word 0 +ext_loader_ver: + .byte 0 +ext_loader_type: + .byte 0 +cmd_line_ptr: + .long 0 +initrd_addr_max: + .long 0xffffffff +kernel_alignment: + .long 0 +relocatable_kernel: + .byte 0 +min_alignment: + .byte 0 +xloadflags: + .word 0 +cmdline_size: + .long 0x7ff +hardware_subarch: + .long 0 +hardware_subarch_data: + .byte 0, 0, 0, 0, 0, 0, 0, 0 + +version_string: + .asciz VERSION + +/***************************************************************************** + * + * Setup code + * + */ + +setup: + /* Fix up code segment */ + pushw %ds + pushw $1f + lret +1: + /* Set up stack just below 0x7c00 and clear direction flag */ + xorw %ax, %ax + movw %ax, %ss + movw $0x7c00, %sp + cld + + /* Retrieve command-line pointer */ + movl cmd_line_ptr, %edx + testl %edx, %edx + jz no_cmd_line + + /* Set up %es:%di to point to command line */ + movl %edx, %edi + andl $0xf, %edi + rorl $4, %edx + movw %dx, %es + + /* Find length of command line */ + pushw %di + movw $0xffff, %cx + repnz scasb + notw %cx + popw %si + + /* Make space for command line on stack */ + movw %sp, %di + subw %cx, %di + andw $~0xf, %di + movw %di, %sp + + /* Copy command line to stack */ + pushw %ds + pushw %es + popw %ds + pushw %ss + popw %es + rep movsb + popw %ds + + /* Store new command-line pointer */ + movzwl %sp, %edx +no_cmd_line: + + /* Calculate maximum relocation address */ + movl ramdisk_image, %ebp + testl %ebp, %ebp + jnz 1f + orl $0xffffffff, %ebp /* Allow arbitrary relocation if no initrd */ +1: + /* Install iPXE */ + call alloc_basemem + xorl %esi, %esi + xorl %edi, %edi + call install_prealloc + + /* Set up real-mode stack */ + movw %bx, %ss + movw $_estack16, %sp + + /* Jump to .text16 segment */ + pushw %ax + pushw $1f + lret + .section ".text16", "awx", @progbits +1: + /* Retrieve initrd pointer and size */ + movl ramdisk_image, %ebp + movl ramdisk_size, %ecx + + /* Set up %ds for access to .data16 */ + movw %bx, %ds + + /* Store command-line pointer */ + movl %edx, cmdline_phys + + /* Store initrd pointer and size */ + movl %ebp, initrd_phys + movl %ecx, initrd_len + + /* Run iPXE */ + pushl $main + pushw %cs + call prot_call + popl %ecx /* discard */ + + /* Uninstall iPXE */ + call uninstall + + /* Boot next device */ + int $0x18 + +/***************************************************************************** + * + * Open payload (called by libprefix) + * + * Parameters: + * %ds:0000 : Prefix + * %esi : Buffer for copy of image source (or zero if no buffer available) + * %ecx : Expected offset within buffer of first payload block + * Returns: + * %esi : Valid image source address (buffered or unbuffered) + * %ecx : Actual offset within buffer of first payload block + * CF set on error + */ + + .section ".text16.early", "awx", @progbits + .globl open_payload +open_payload: + + /* Our payload will always end up at BZI_LOAD_HIGH_ADDR */ + movl $BZI_LOAD_HIGH_ADDR, %esi + xorl %ecx, %ecx + lret + + /* Payload must be aligned to a whole number of setup sectors */ + .globl _payload_align + .equ _payload_align, 512 -- cgit 1.2.3-korg