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All machines now use the linuxboot_dma.bin binary, so it's safe to remove the non-DMA version (linuxboot.bin). Suggested-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Zhao Liu <zhao1.liu@intel.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/r/20260108033051.777361-16-zhao1.liu@intel.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>master
Philippe Mathieu-Daudé
7 months ago
committed by
Paolo Bonzini
Paolo Bonzini
4 changed files with 2 additions and 199 deletions
@ -1,195 +0,0 @@ |
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/* |
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* Linux Boot Option ROM |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, see <http://www.gnu.org/licenses/>. |
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* |
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* Copyright Novell Inc, 2009 |
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* Authors: Alexander Graf <agraf@suse.de> |
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* |
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* Based on code in hw/pc.c. |
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*/ |
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#include "optionrom.h" |
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#define BOOT_ROM_PRODUCT "Linux loader" |
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BOOT_ROM_START |
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run_linuxboot: |
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cli |
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cld |
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jmp copy_kernel |
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boot_kernel: |
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read_fw FW_CFG_SETUP_ADDR |
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mov %eax, %ebx |
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shr $4, %ebx |
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/* All segments contain real_addr */ |
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mov %bx, %ds |
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mov %bx, %es |
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mov %bx, %fs |
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mov %bx, %gs |
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mov %bx, %ss |
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/* CX = CS we want to jump to */ |
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add $0x20, %bx |
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mov %bx, %cx |
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/* SP = cmdline_addr-real_addr-16 */ |
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read_fw FW_CFG_CMDLINE_ADDR |
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mov %eax, %ebx |
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read_fw FW_CFG_SETUP_ADDR |
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sub %eax, %ebx |
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sub $16, %ebx |
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mov %ebx, %esp |
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/* Build indirect lret descriptor */ |
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pushw %cx /* CS */ |
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xor %ax, %ax |
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pushw %ax /* IP = 0 */ |
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/* Clear registers */ |
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xor %eax, %eax |
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xor %ebx, %ebx |
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xor %ecx, %ecx |
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xor %edx, %edx |
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xor %edi, %edi |
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xor %ebp, %ebp |
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/* Jump to Linux */ |
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lret |
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copy_kernel: |
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/* Read info block in low memory (0x10000 or 0x90000) */ |
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read_fw FW_CFG_SETUP_ADDR |
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shr $4, %eax |
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mov %eax, %es |
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xor %edi, %edi |
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read_fw_blob_addr32_edi(FW_CFG_SETUP) |
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cmpw $0x203, %es:0x206 // if protocol >= 0x203 |
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jae 1f // have initrd_max |
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movl $0x37ffffff, %es:0x22c // else assume 0x37ffffff |
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1: |
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/* Check if using kernel-specified initrd address */ |
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read_fw FW_CFG_INITRD_ADDR |
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mov %eax, %edi // (load_kernel wants it in %edi) |
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read_fw FW_CFG_INITRD_SIZE // find end of initrd |
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add %edi, %eax |
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xor %es:0x22c, %eax // if it matches es:0x22c |
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and $-4096, %eax // (apart from padding for page) |
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jz load_kernel // then initrd is not at top |
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// of memory |
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/* pc.c placed the initrd at end of memory. Compute a better |
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* initrd address based on e801 data. |
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*/ |
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mov $0xe801, %ax |
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xor %cx, %cx |
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xor %dx, %dx |
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int $0x15 |
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/* Output could be in AX/BX or CX/DX */ |
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or %cx, %cx |
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jnz 1f |
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or %dx, %dx |
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jnz 1f |
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mov %ax, %cx |
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mov %bx, %dx |
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1: |
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or %dx, %dx |
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jnz 2f |
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addw $1024, %cx /* add 1 MB */ |
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movzwl %cx, %edi |
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shll $10, %edi /* convert to bytes */ |
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jmp 3f |
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2: |
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addw $16777216 >> 16, %dx /* add 16 MB */ |
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movzwl %dx, %edi |
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shll $16, %edi /* convert to bytes */ |
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3: |
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read_fw FW_CFG_INITRD_SIZE |
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subl %eax, %edi |
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andl $-4096, %edi /* EDI = start of initrd */ |
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movl %edi, %es:0x218 /* put it in the header */ |
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load_kernel: |
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/* We need to load the kernel into memory we can't access in 16 bit |
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mode, so let's get into 32 bit mode, write the kernel and jump |
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back again. */ |
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/* Reserve space on the stack for our GDT descriptor. */ |
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mov %esp, %ebp |
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sub $16, %esp |
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/* Now create the GDT descriptor */ |
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movw $((3 * 8) - 1), -16(%bp) |
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mov %cs, %eax |
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movzwl %ax, %eax |
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shl $4, %eax |
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addl $gdt, %eax |
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movl %eax, -14(%bp) |
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/* And load the GDT */ |
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data32 lgdt -16(%bp) |
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mov %ebp, %esp |
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/* Get us to protected mode now */ |
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mov $1, %eax |
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mov %eax, %cr0 |
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/* So we can set ES to a 32-bit segment */ |
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mov $0x10, %eax |
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mov %eax, %es |
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/* We're now running in 16-bit CS, but 32-bit ES! */ |
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/* Load kernel and initrd */ |
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read_fw_blob_addr32_edi(FW_CFG_INITRD) |
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read_fw_blob_addr32(FW_CFG_KERNEL) |
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read_fw_blob_addr32(FW_CFG_CMDLINE) |
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/* And now jump into Linux! */ |
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mov $0, %eax |
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mov %eax, %cr0 |
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/* ES = CS */ |
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mov %cs, %ax |
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mov %ax, %es |
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jmp boot_kernel |
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/* Variables */ |
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.align 4, 0 |
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gdt: |
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/* 0x00 */ |
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.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
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/* 0x08: code segment (base=0, limit=0xfffff, type=32bit code exec/read, DPL=0, 4k) */ |
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00 |
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/* 0x10: data segment (base=0, limit=0xfffff, type=32bit data read/write, DPL=0, 4k) */ |
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00 |
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BOOT_ROM_END |
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