diff options
| -rw-r--r-- | Makefile | 8 | ||||
| -rw-r--r-- | Makefile.private | 9 | ||||
| -rw-r--r-- | bcopy32.inc | 39 | ||||
| -rw-r--r-- | config.inc | 37 | ||||
| -rw-r--r-- | cpuinit.inc | 106 | ||||
| -rw-r--r-- | isolinux-debug.asm | 21 | ||||
| -rw-r--r-- | isolinux.asm | 100 | ||||
| -rw-r--r-- | ldlinux.asm | 101 | ||||
| -rw-r--r-- | pxelinux.asm | 87 | ||||
| -rw-r--r-- | runkernel.inc | 5 |
10 files changed, 225 insertions, 288 deletions
@@ -39,7 +39,7 @@ VERSION = $(shell cat version) # CSRC = syslinux.c gethostip.c NASMSRC = ldlinux.asm syslinux.asm copybs.asm \ - pxelinux.asm mbr.asm isolinux.asm + pxelinux.asm mbr.asm isolinux.asm isolinux-debug.asm SOURCES = $(CSRC) $(NASMSRC) *.inc BTARGET = ldlinux.bss ldlinux.sys ldlinux.bin ldlinux.lst \ pxelinux.0 mbr.bin isolinux.bin isolinux-debug.bin @@ -102,10 +102,10 @@ pxelinux.0: pxelinux.bin cp pxelinux.bin pxelinux.0 # Special verbose version of isolinux.bin -isolinux-debug.bin: isolinux.asm kwdhash.inc +isolinux-debug.bin: isolinux-debug.asm kwdhash.inc $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" \ - -dHEXDATE="$(HEXDATE)" -dDEBUG_MESSAGES \ - -l isolinux-debug.lst -o isolinux-debug.bin isolinux.asm + -dHEXDATE="$(HEXDATE)" \ + -l isolinux-debug.lst -o isolinux-debug.bin isolinux-debug.asm ldlinux.bss: ldlinux.bin dd if=ldlinux.bin of=ldlinux.bss bs=512 count=1 diff --git a/Makefile.private b/Makefile.private index d03a51d8..5f650621 100644 --- a/Makefile.private +++ b/Makefile.private @@ -1,6 +1,6 @@ ## -*- makefile -*- ------------------------------------------------------ ## -## Copyright 2000 H. Peter Anvin - All Rights Reserved +## Copyright 2000-2002 H. Peter Anvin - All Rights Reserved ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by @@ -20,9 +20,12 @@ PRIVATE = Makefile.private -isolinux.iso: isolinux-debug.bin +isolinux.iso: all cp isolinux-debug.bin isolinux-test/isolinux/isolinux.bin - mkisofs -v -r -J -o isolinux.iso isolinux-test + mkisofs -v -r -J \ + -b isolinux/isolinux.bin -c isolinux/boot.cat \ + -no-emul-boot -boot-load-size 4 -boot-info-table \ + -o isolinux.iso isolinux-test burn: isolinux.iso cdrecord -v blank=fast isolinux.iso diff --git a/bcopy32.inc b/bcopy32.inc index af322f91..ed14aee8 100644 --- a/bcopy32.inc +++ b/bcopy32.inc @@ -77,7 +77,7 @@ bcopy: push eax mov eax,cr0 or al,1 mov cr0,eax ; Enter protected mode - jmp 08h:.in_pm +.adj3a: jmp 08h:.in_pm .in_pm: mov ax,10h ; Data segment selector mov es,ax @@ -91,23 +91,20 @@ bcopy: push eax mov al,cl ; Save low bits shr ecx,2 ; Convert to dwords a32 rep movsd ; Do our business + ; At this point ecx == 0 - test al,2 - jz .noword - a32 movsw -.noword: - test al,1 - jz .nobyte - a32 movsb -.nobyte: - - mov es,ax ; Set to "real-mode-like" + mov cl,al ; Copy any fractional dword + and cl,3 + a32 rep movsb + + mov al,18h ; "Real-mode-like" data segment + mov es,ax mov ds,ax - + mov eax,cr0 and al,~1 mov cr0,eax ; Disable protected mode -.adj3: jmp 0:.in_rm +.adj3b: jmp 0:.in_rm .in_rm: ; Back in real mode lss sp,[cs:SavedSSSP] @@ -144,7 +141,6 @@ bcopy: push eax A20List dw a20_dunno, a20_none, a20_bios, a20_kbc, a20_fast A20DList dw a20d_dunno, a20d_none, a20d_bios, a20d_kbc, a20d_fast a20_adjust_cnt equ ($-A20List)/2 -A20Type dw A20_DUNNO ; A20 type unknown slow_out: out dx, al ; Fall through @@ -160,7 +156,9 @@ try_enable_a20: ; ; Flush the caches ; -; call try_wbinvd +%if DO_WBINVD + call try_wbinvd +%endif ; ; If the A20 type is known, jump straight to type @@ -287,7 +285,9 @@ disable_a20: ; ; Flush the caches ; -; call try_wbinvd +%if DO_WBINVD + call try_wbinvd +%endif mov bp,[cs:A20Type] add bp,bp ; Convert to word offset @@ -359,11 +359,13 @@ empty_8042: .done: ret ; -; WBINVD instruction; gets auto-eliminated on 386 CPUs +; Execute a WBINVD instruction if possible on this CPU ; +%if DO_WBINVD try_wbinvd: wbinvd ret +%endif ; ; bcopy_over_self: @@ -388,7 +390,8 @@ try_wbinvd: align 2 adjlist dw bcopy_gdt.adj1 - ADJUST dw bcopy.adj2 + 5 - ADJUST - dw bcopy.adj3 + 1 - ADJUST + dw bcopy.adj3a + 1 - ADJUST + dw bcopy.adj3b + 1 - ADJUST dw try_enable_a20.adj4 + 3 - ADJUST dw disable_a20.adj5 + 3 - ADJUST adjlist_cnt equ ($-adjlist)/2 diff --git a/config.inc b/config.inc new file mode 100644 index 00000000..3282d5b9 --- /dev/null +++ b/config.inc @@ -0,0 +1,37 @@ +;; $Id$ +;; ----------------------------------------------------------------------- +;; +;; Copyright 2002 H. Peter Anvin - All Rights Reserved +;; +;; This program is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, +;; Bostom MA 02111-1307, USA; either version 2 of the License, or +;; (at your option) any later version; incorporated herein by reference. +;; +;; ----------------------------------------------------------------------- + +;; +;; config.inc +;; +;; Common configuration options. Some of these are imposed by the kernel. +;; + +%ifndef _CONFIG_INC +%define _CONFIG_INC + +max_cmd_len equ 255 ; Must be odd; 255 is the kernel limit +HIGHMEM_MAX equ 037FFFFFFh ; DEFAULT highest address for an initrd +DEFAULT_BAUD equ 9600 ; Default baud rate for serial port +BAUD_DIVISOR equ 115200 ; Serial port parameter + +%assign DO_WBINVD 0 ; Should we use WBINVD or not? + +; +; Should be updated with every release to avoid bootsector/SYS file mismatch +; +%define version_str VERSION ; Must be 4 characters long! +%define date DATE_STR ; Defined from the Makefile +%define year '2002' + +%endif ; _CONFIG_INC diff --git a/cpuinit.inc b/cpuinit.inc new file mode 100644 index 00000000..a6923b54 --- /dev/null +++ b/cpuinit.inc @@ -0,0 +1,106 @@ +;; $Id$ +;; ----------------------------------------------------------------------- +;; +;; Copyright 1994-2002 H. Peter Anvin - All Rights Reserved +;; +;; This program is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, +;; Bostom MA 02111-1307, USA; either version 2 of the License, or +;; (at your option) any later version; incorporated herein by reference. +;; +;; ----------------------------------------------------------------------- + +;; +;; cpuinit.inc +;; +;; CPU-dependent initialization and related checks. +;; + +; +; Check that no moron is trying to boot Linux on a 286 or so. According +; to Intel, the way to check is to see if the high 4 bits of the FLAGS +; register are either all stuck at 1 (8086/8088) or all stuck at 0 +; (286 in real mode), if not it is a 386 or higher. They didn't +; say how to check for a 186/188, so I *hope* it falls out as a 8086 +; or 286 in this test. +; +; Also, provide an escape route in case it doesn't work. +; +check_escapes: + mov ah,02h ; Check keyboard flags + int 16h + mov [KbdFlags],al ; Save for boot prompt check + test al,04h ; Ctrl->skip 386 check + jnz skip_checks +test_8086: + pushf ; Get flags + pop ax + and ax,0FFFh ; Clear top 4 bits + push ax ; Load into FLAGS + popf + pushf ; And load back + pop ax + and ax,0F000h ; Get top 4 bits + cmp ax,0F000h ; If set -> 8086/8088 + je not_386 +test_286: + pushf ; Get flags + pop ax + or ax,0F000h ; Set top 4 bits + push ax + popf + pushf + pop ax + and ax,0F000h ; Get top 4 bits + jnz is_386 ; If not clear -> 386 +not_386: + mov si,err_not386 + call writestr + jmp kaboom +is_386: + ; Now we know it's a 386 or higher +; +; Now check that there is sufficient low (DOS) memory +; + int 12h + cmp ax,(real_mode_seg+0xa00) >> 6 + jae enough_ram + mov si,err_noram + call writestr + jmp kaboom +enough_ram: +skip_checks: + +; +; Check if we're 386 (as opposed to 486+); if so we need to blank out +; the WBINVD instruction +; +; We check for 486 by setting EFLAGS.AC +; +%if DO_WBINVD + pushfd ; Save the good flags + pushfd + pop eax + mov ebx,eax + xor eax,(1 << 18) ; AC bit + push eax + popfd + pushfd + pop eax + popfd ; Restore the original flags + xor eax,ebx + jnz is_486 +; +; 386 - Looks like we better blot out the WBINVD instruction +; + mov byte [try_wbinvd],0c3h ; Near RET +is_486: +%endif ; DO_WBINVD +; +; Mark A20 type as unknown. This particular word needs to be in BSS, +; so it needs to be initialized. +; + mov word [A20Type],0 + + diff --git a/isolinux-debug.asm b/isolinux-debug.asm new file mode 100644 index 00000000..be3b6cec --- /dev/null +++ b/isolinux-debug.asm @@ -0,0 +1,21 @@ +;; $Id$ +;; ----------------------------------------------------------------------- +;; +;; Copyright 2002 H. Peter Anvin - All Rights Reserved +;; +;; This program is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, +;; Bostom MA 02111-1307, USA; either version 2 of the License, or +;; (at your option) any later version; incorporated herein by reference. +;; +;; ----------------------------------------------------------------------- + +;; +;; isolinux-debug.asm +;; +;; Wrapper for debugging version of ISOLINUX +;; + +%define DEBUG_MESSAGES +%include "isolinux.asm" diff --git a/isolinux.asm b/isolinux.asm index d9e6682c..b3a4a7ac 100644 --- a/isolinux.asm +++ b/isolinux.asm @@ -21,36 +21,25 @@ %define IS_ISOLINUX 1 %include "macros.inc" +%include "config.inc" %include "kernel.inc" %include "bios.inc" %include "tracers.inc" ; -; Some semi-configurable constants... change on your own risk. Most are imposed -; by the kernel. +; Some semi-configurable constants... change on your own risk. ; my_id equ isolinux_id -max_cmd_len equ 255 ; Must be odd; 255 is the kernel limit FILENAME_MAX_LG2 equ 8 ; log2(Max filename size Including final null) FILENAME_MAX equ (1 << FILENAME_MAX_LG2) NULLFILE equ 0 ; Zero byte == null file name -HIGHMEM_MAX equ 037FFFFFFh ; DEFAULT highest address for an initrd %assign HIGHMEM_SLOP 128*1024 ; Avoid this much memory near the top -DEFAULT_BAUD equ 9600 ; Default baud rate for serial port -BAUD_DIVISOR equ 115200 ; Serial port parameter MAX_OPEN_LG2 equ 6 ; log2(Max number of open files) MAX_OPEN equ (1 << MAX_OPEN_LG2) SECTORSIZE_LG2 equ 11 ; 2048 bytes/sector (El Torito requirement) SECTORSIZE equ (1 << SECTORSIZE_LG2) ; -; Should be updated with every release to avoid bootsector/SYS file mismatch -; -%define version_str VERSION ; Must be 4 characters long! -%define date DATE_STR ; Defined from the Makefile -%define year '2002' - -; ; The following structure is used for "virtual kernels"; i.e. LILO-style ; option labels. The options we permit here are `kernel' and `append ; Since there is no room in the bottom 64K for all of these, we @@ -173,6 +162,7 @@ InitRDCNameLen resw 1 ; Length of unmangled initrd name NextCharJump resw 1 ; Routine to interpret next print char SetupSecs resw 1 ; Number of setup sectors A20Test resw 1 ; Counter for testing status of A20 +A20Type resw 1 ; A20 type CmdLineLen resw 1 ; Length of command line including null GraphXSize resw 1 ; Width of splash screen file VGAPos resw 1 ; Pointer into VGA memory @@ -713,6 +703,11 @@ all_read: TRACER '>' ; +; Common initialization code +; +%include "cpuinit.inc" + +; ; Clear Files structures ; mov di,Files @@ -720,85 +715,6 @@ all_read: xor eax,eax rep stosd -; -; Check that no moron is trying to boot Linux on a 286 or so. According -; to Intel, the way to check is to see if the high 4 bits of the FLAGS -; register are either all stuck at 1 (8086/8088) or all stuck at 0 -; (286 in real mode), if not it is a 386 or higher. They didn't -; say how to check for a 186/188, so I *hope* it falls out as a 8086 -; or 286 in this test. -; -; Also, provide an escape route in case it doesn't work. -; -check_escapes: - mov ah,02h ; Check keyboard flags - int 16h - mov [KbdFlags],al ; Save for boot prompt check - test al,04h ; Ctrl->skip 386 check - jnz skip_checks -test_8086: - pushf ; Get flags - pop ax - and ax,0FFFh ; Clear top 4 bits - push ax ; Load into FLAGS - popf - pushf ; And load back - pop ax - and ax,0F000h ; Get top 4 bits - cmp ax,0F000h ; If set -> 8086/8088 - je not_386 -test_286: - pushf ; Get flags - pop ax - or ax,0F000h ; Set top 4 bits - push ax - popf - pushf - pop ax - and ax,0F000h ; Get top 4 bits - jnz is_386 ; If not clear -> 386 -not_386: - mov si,err_not386 - call writestr - jmp kaboom -is_386: - ; Now we know it's a 386 or higher -; -; Now check that there is sufficient low (DOS) memory -; - int 12h - cmp ax,(real_mode_seg+0xa00) >> 6 - jae enough_ram - mov si,err_noram - call writestr - jmp kaboom -enough_ram: -skip_checks: - -; -; Check if we're 386 (as opposed to 486+); if so we need to blank out -; the WBINVD instruction -; -; We check for 486 by setting EFLAGS.AC -; - pushfd ; Save the good flags - pushfd - pop eax - mov ebx,eax - xor eax,(1 << 18) ; AC bit - push eax - popfd - pushfd - pop eax - popfd ; Restore the original flags - xor eax,ebx - jnz is_486 -; -; 386 - Looks like we better blot out the WBINVD instruction -; - mov byte [try_wbinvd],0c3h ; Near RET -is_486: - ; ; Now we're all set to start with our *real* business. First load the ; configuration file (if any) and parse it. diff --git a/ldlinux.asm b/ldlinux.asm index ec8157d1..8bfdf763 100644 --- a/ldlinux.asm +++ b/ldlinux.asm @@ -28,30 +28,20 @@ %define IS_SYSLINUX 1 %include "macros.inc" +%include "config.inc" %include "kernel.inc" %include "bios.inc" %include "tracers.inc" ; -; Some semi-configurable constants... change on your own risk. Most are imposed -; by the kernel. +; Some semi-configurable constants... change on your own risk. ; my_id equ syslinux_id -max_cmd_len equ 255 ; Must be odd; 255 is the kernel limit FILENAME_MAX_LG2 equ 4 ; log2(Max filename size Including final null) FILENAME_MAX equ 11 ; Max mangled filename size NULLFILE equ ' ' ; First char space == null filename retry_count equ 6 ; How patient are we with the disk? -HIGHMEM_MAX equ 037FFFFFFh ; DEFAULT highest address for an initrd %assign HIGHMEM_SLOP 0 ; Avoid this much memory near the top -DEFAULT_BAUD equ 9600 ; Default baud rate for serial port -BAUD_DIVISOR equ 115200 ; Serial port parameter -; -; Should be updated with every release to avoid bootsector/SYS file mismatch -; -%define version_str VERSION ; Must be 4 characters long! -%define date DATE_STR ; Defined from the Makefile -%define year '2002' ; ; The following structure is used for "virtual kernels"; i.e. LILO-style @@ -170,6 +160,7 @@ InitRDCNameLen resw 1 ; Length of unmangled initrd name NextCharJump resw 1 ; Routine to interpret next print char SetupSecs resw 1 ; Number of setup sectors A20Test resw 1 ; Counter for testing status of A20 +A20Type resw 1 ; A20 type CmdLineLen resw 1 ; Length of command line including null GraphXSize resw 1 ; Width of splash screen file VGAPos resw 1 ; Pointer into VGA memory @@ -937,83 +928,11 @@ all_read: ; mov si,copyright_str call writestr + ; -; Check that no moron is trying to boot Linux on a 286 or so. According -; to Intel, the way to check is to see if the high 4 bits of the FLAGS -; register are either all stuck at 1 (8086/8088) or all stuck at 0 -; (286 in real mode), if not it is a 386 or higher. They didn't -; say how to check for a 186/188, so I *hope* it falls out as a 8086 -; or 286 in this test. -; -; Also, provide an escape route in case it doesn't work. -; -check_escapes: - mov ah,02h ; Check keyboard flags - int 16h - mov [KbdFlags],al ; Save for boot prompt check - test al,04h ; Ctrl->skip 386 check - jnz skip_checks -test_8086: - pushf ; Get flags - pop ax - and ax,0FFFh ; Clear top 4 bits - push ax ; Load into FLAGS - popf - pushf ; And load back - pop ax - and ax,0F000h ; Get top 4 bits - cmp ax,0F000h ; If set -> 8086/8088 - je not_386 -test_286: - pushf ; Get flags - pop ax - or ax,0F000h ; Set top 4 bits - push ax - popf - pushf - pop ax - and ax,0F000h ; Get top 4 bits - jnz is_386 ; If not clear -> 386 -not_386: - mov si,err_not386 - call writestr - jmp kaboom -is_386: - ; Now we know it's a 386 or higher -; -; Now check that there is sufficient low (DOS) memory -; - int 12h - cmp ax,(real_mode_seg+0xa00) >> 6 - jae enough_ram - mov si,err_noram - call writestr - jmp kaboom -enough_ram: -skip_checks: -; -; Check if we're 386 (as opposed to 486+); if so we need to blank out -; the WBINVD instruction -; -; We check for 486 by setting EFLAGS.AC -; - pushfd ; Save the good flags - pushfd - pop eax - mov ebx,eax - xor eax,(1 << 18) ; AC bit - push eax - popfd - pushfd - pop eax - popfd ; Restore the original flags - xor eax,ebx - jnz is_486 -; -; 386 - Looks like we better blot out the WBINVD instruction +; Common initialization code ; - mov byte [try_wbinvd],0c3h ; Near RET -is_486: +%include "cpuinit.inc" ; ; Initialization that does not need to go into the any of the pre-load @@ -1029,6 +948,14 @@ is_486: mov word [kaboom.patch+1],kaboom2-(kaboom.patch+3) ; +; Compute some parameters that depend on cluster size +; + mov dx,1 + xor ax,ax + div word [ClustSize] + mov [ClustPerMoby],ax ; Clusters/64K + +; ; Now we're all set to start with our *real* business. First load the ; configuration file (if any) and parse it. ; diff --git a/pxelinux.asm b/pxelinux.asm index f447b7de..6735615f 100644 --- a/pxelinux.asm +++ b/pxelinux.asm @@ -20,25 +20,21 @@ %define IS_PXELINUX 1 %include "macros.inc" +%include "config.inc" %include "kernel.inc" %include "bios.inc" %include "tracers.inc" %include "pxe.inc" ; -; Some semi-configurable constants... change on your own risk. Most are imposed -; by the kernel. +; Some semi-configurable constants... change on your own risk. ; my_id equ pxelinux_id -max_cmd_len equ 255 ; Must be odd; 255 is the kernel limit FILENAME_MAX_LG2 equ 6 ; log2(Max filename size Including final null) FILENAME_MAX equ (1 << FILENAME_MAX_LG2) NULLFILE equ 0 ; Zero byte == null file name REBOOT_TIME equ 5*60 ; If failure, time until full reset -HIGHMEM_MAX equ 037FFFFFFh ; DEFAULT highest address for an initrd %assign HIGHMEM_SLOP 128*1024 ; Avoid this much memory near the top -DEFAULT_BAUD equ 9600 ; Default baud rate for serial port -BAUD_DIVISOR equ 115200 ; Serial port parameter MAX_SOCKETS_LG2 equ 6 ; log2(Max number of open sockets) MAX_SOCKETS equ (1 << MAX_SOCKETS_LG2) TFTP_PORT equ htons(69) ; Default TFTP port @@ -213,6 +209,7 @@ InitRDCNameLen resw 1 ; Length of unmangled initrd name NextCharJump resw 1 ; Routine to interpret next print char SetupSecs resw 1 ; Number of setup sectors A20Test resw 1 ; Counter for testing status of A20 +A20Type resw 1 ; A20 type CmdLineLen resw 1 ; Length of command line including null GraphXSize resw 1 ; Width of splash screen file VGAPos resw 1 ; Pointer into VGA memory @@ -593,84 +590,10 @@ udp_init: jmp kaboom .success: -; -; Check that no moron is trying to boot Linux on a 286 or so. According -; to Intel, the way to check is to see if the high 4 bits of the FLAGS -; register are either all stuck at 1 (8086/8088) or all stuck at 0 -; (286 in real mode), if not it is a 386 or higher. They didn't -; say how to check for a 186/188, so I *hope* it falls out as a 8086 -; or 286 in this test. -; -; Also, provide an escape route in case it doesn't work. -; -check_escapes: - mov ah,02h ; Check keyboard flags - int 16h - mov [KbdFlags],al ; Save for boot prompt check - test al,04h ; Ctrl->skip 386 check - jnz skip_checks -test_8086: - pushf ; Get flags - pop ax - and ax,0FFFh ; Clear top 4 bits - push ax ; Load into FLAGS - popf - pushf ; And load back - pop ax - and ax,0F000h ; Get top 4 bits - cmp ax,0F000h ; If set -> 8086/8088 - je not_386 -test_286: - pushf ; Get flags - pop ax - or ax,0F000h ; Set top 4 bits - push ax - popf - pushf - pop ax - and ax,0F000h ; Get top 4 bits - jnz is_386 ; If not clear -> 386 -not_386: - mov si,err_not386 - call writestr - jmp kaboom -is_386: - ; Now we know it's a 386 or higher -; -; Now check that there is sufficient low (DOS) memory -; - int 12h - cmp ax,(real_mode_seg+0xa00) >> 6 - jae enough_ram - mov si,err_noram - call writestr - jmp kaboom -enough_ram: -skip_checks: - -; -; Check if we're 386 (as opposed to 486+); if so we need to blank out -; the WBINVD instruction -; -; We check for 486 by setting EFLAGS.AC -; - pushfd ; Save the good flags - pushfd - pop eax - mov ebx,eax - xor eax,(1 << 18) ; AC bit - push eax - popfd - pushfd - pop eax - popfd ; Restore the original flags - xor eax,ebx - jnz is_486 ; -; 386 - Looks like we better blot out the WBINVD instruction +; Common initialization code ; - mov byte [try_wbinvd],0c3h ; Near RET -is_486: +%include "cpuinit.inc" ; ; Now we're all set to start with our *real* business. First load the diff --git a/runkernel.inc b/runkernel.inc index 1240444c..165af987 100644 --- a/runkernel.inc +++ b/runkernel.inc @@ -318,13 +318,14 @@ read_kernel: ; Move the stuff beyond the setup code to high memory at 100000h ; movzx esi,word [SetupSecs] ; Setup sectors - inc esi ; plus 1 boot sector - shl esi,9 ; Convert to bytes + inc si ; plus 1 boot sector + shl si,9 ; Convert to bytes mov ecx,8000h ; 32K sub ecx,esi ; Number of bytes to copy push ecx add esi,(real_mode_seg << 4) ; Pointer to source mov edi,100000h ; Copy to address 100000h + call bcopy ; Transfer to high memory ; On exit EDI -> where to load the rest |