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Diffstat (limited to 'core/comboot.inc')
-rw-r--r--core/comboot.inc449
1 files changed, 38 insertions, 411 deletions
diff --git a/core/comboot.inc b/core/comboot.inc
index fcd6c756..3197c8a7 100644
--- a/core/comboot.inc
+++ b/core/comboot.inc
@@ -95,7 +95,7 @@ comboot_setup_api:
; Restore the original state of the COMBOOT API vectors, and free
; any low memory allocated by the comboot module.
;
- global comboot_cleanup_api
+ global comboot_cleanup_api:function hidden
comboot_cleanup_api:
pusha
mov si,DOSSaveVectors
@@ -114,7 +114,7 @@ DOSSaveVectors resd 32
comboot_vectors:
dw comboot_return ; INT 20 = exit
- dw comboot_int21 ; INT 21 = DOS-compatible system calls
+ dw comboot_err(21h) ; INT 21 = DOS-compatible system calls
dw comboot_int22 ; INT 22 = native system calls
dw comboot_err(23h) ; INT 23 = DOS Ctrl-C handler
dw comboot_err(24h) ; INT 24 = DOS critical error handler
@@ -148,31 +148,6 @@ comboot_vectors:
section .text16
-; INT 21h: generic DOS system call
-comboot_int21: sti
- push ds
- push es
- push fs
- push gs
- pushad
- cld
- mov bp,cs
- mov ds,bp
- mov es,bp
- mov bp,sp ; Set up stack frame
-
- pm_call pm_adjust_screen ; The COMBOOT program might hav changed the screen
-
- mov cx,int21_count
- mov si,int21_table
-.again: lodsb
- cmp al,P_AH
- lodsw
- loopne .again
- ; The last function in the list is the
- ; "no such function" function
- clc
- call ax ; Call the invoked function
comboot_resume:
mov bp,sp ; In case the function clobbers BP
setc P_FLAGSL ; Propagate CF->error
@@ -212,7 +187,7 @@ comboot_bogus_tail:
jmp kaboom
; Proper return vector
-; Note: this gets invoked both via INT 21h and directly via INT 20h.
+; Note: this gets invoked directly via INT 20h.
; We don't need to cld explicitly here, because comboot_exit does that
; when invoking RESET_STACK_AND_SEGS.
comboot_return:
@@ -367,348 +342,36 @@ comapi_err:
ret
;
-; INT 22h AX=0001h Get SYSLINUX version
+; INT 22h AX=001Ch Get pointer to auxillary data vector
;
-comapi_get_version:
- ; Number of API functions supported
- mov P_AX,int22_count
- ; SYSLINUX version
- mov P_CX,(VERSION_MAJOR << 8)+VERSION_MINOR
- ; SYSLINUX derivative ID byte
- mov P_DX,my_id
- ; For future use
- mov P_BX,cs ; cs == 0
-
+comapi_getadv:
mov P_ES,ds
- ; ES:SI -> version banner
- mov P_SI,syslinux_banner + 2 ; Skip leading CR LF
- ; ES:DI -> copyright string
- mov P_DI,copyright_str + 1 ; Skip leading space
-
-comapi_nop:
- clc
- ret
-
-;
-; INT 22h AX=0002h Write string
-;
-; Write null-terminated string in ES:BX
-;
-comapi_writestr:
- mov ds,P_ES
- mov si,P_BX
- pm_call pm_writestr
- clc
- ret
-
-;
-; INT 22h AX=0003h Run command
-;
-; Terminates the COMBOOT program and executes the command line in
-; ES:BX as if it had been entered by the user.
-;
-comapi_run:
- mov es,P_ES
- mov bx,P_BX
- pm_call pm_env32_run
- ret
-
-;
-; INT 22h AX=0004h Run default command
-;
-; Terminates the COMBOOT program and executes the default command line
-; as if a timeout had happened or the user pressed <Enter>.
-;
-comapi_run_default:
- push auto_boot
- jmp comboot_exit
-
-;
-; INT 22h AX=0005h Force text mode
-;
-; Puts the video in standard text mode
-;
-comapi_textmode:
- pm_call syslinux_force_text_mode
- clc
- ret
-
-;
-; INT 22h AX=0006h Open file
-;
-comapi_open:
- mov es,P_ES
- mov si,P_SI
- pm_call pm_open_file
- mov P_EAX,eax
- mov P_CX,cx
- mov P_SI,si
- ret
-
-;
-; INT 22h AX=0007h Read file
-;
-comapi_read:
- mov es,P_ES
- mov bx,P_BX
- mov si,P_SI
- mov cx,P_CX
- pm_call getfssec
- jnc .noteof
- xor si,si ; SI <- 0 on EOF, CF <- 0
-.noteof: mov P_SI,si
- mov P_ECX,ecx
- ret
-
-;
-; INT 22h AX=0008h Close file
-;
-comapi_close:
- mov si,P_SI
- pm_call pm_close_file
- clc
- ret
-
-;
-; INT 22h AX=0009h Call PXE stack
-;
-%if IS_PXELINUX
-comapi_pxecall:
- mov bx,P_BX
- mov es,P_ES
- mov di,P_DI
- call pxenv
- mov ax,[PXEStatus]
- mov P_AX,ax
+ mov P_BX,adv0.data
+ mov P_CX,ADV_LEN
ret
-%else
-comapi_pxecall equ comapi_err ; Not available
-%endif
;
-; INT 22h AX=000Bh Get Serial Console Configuration
+; INT 22h AX=001Dh Write auxillary data vector
;
-comapi_serialcfg:
- pm_call pm_serialcfg
- mov P_DX,ax
- mov P_CX,cx
- mov P_BX,bx
- clc
- ret
+comapi_writeadv equ adv_write
;
-; INT 22h AX=000Ch Perform final cleanup
+; INT 22h AX=0024h Cleanup, shuffle and boot raw
;
-comapi_cleanup:
+comapi_shufraw:
%if IS_PXELINUX
; Unload PXE if requested
test dl,3
setnz [KeepPXE]
- sub bp,sp ; unload_pxe may move the stack around
+ sub bp,sp ; unload_pxe may move the stack around
pm_call unload_pxe
- add bp,sp ; restore frame pointer...
+ add bp,sp ; restore frame pointer...
%elif IS_SYSLINUX || IS_EXTLINUX
; Restore original FDC table
mov eax,[OrigFDCTabPtr]
mov [fdctab],eax
%endif
pm_call cleanup_hardware
- clc
- ret
-
-;
-; INT 22h AX=000Dh Obsolete
-;
-
-;
-; INT 22h AX=000Eh Get configuration file name
-;
-comapi_configfile:
- mov P_ES,cs
- mov P_BX,ConfigName
- clc
- ret
-
-;
-; INT 22h AX=000Fh Get IPAPPEND strings
-;
-comapi_ipappend:
- mov P_ES,cs
- mov P_CX,numIPAppends
- mov P_BX,IPAppends
- clc
- ret
-
-;
-; INT 22h AX=0010h Resolve hostname
-;
-%if IS_PXELINUX
- extern pm_pxe_dns_resolv
-comapi_dnsresolv:
- mov ds,P_ES
- mov si,P_BX
- pm_call pm_pxe_dns_resolv
- mov P_EAX,eax
- clc
- ret
-%else
-comapi_dnsresolv equ comapi_err
-%endif
-
- section .text16
-
-;
-; INT 22h AX=0011h Obsolete
-;
-
-;
-; INT 22h AX=0012h Obsolete
-;
-
-;
-; INT 22h AX=0013h Idle call
-;
-comapi_idle:
- call do_idle
- clc
- ret
-
-;
-; INT 22h AX=0014h Local boot
-;
-comapi_localboot:
- mov ax,P_DX
- pm_call pm_local_boot
- ret
-
-;
-; INT 22h AX=0015h Feature flags
-;
-comapi_features:
- mov P_ES,cs
- mov P_BX,feature_flags
- mov P_CX,feature_flags_len
- clc
- ret
-
-;
-; INT 22h AX=0016h Run kernel image
-;
-comapi_runkernel:
- ret
-
-;
-; INT 22h AX=0017h Report video mode change
-;
-comapi_usingvga:
- mov ax,P_BX
- cmp ax,0Fh ; Unknown flags = failure
- ja .error
- mov cx,P_CX
- mov dx,P_DX
- pm_call pm_using_vga
- clc
- ret
-.error:
- stc
- ret
-
-;
-; INT 22h AX=0018h Query custom font
-;
-comapi_userfont:
- mov al,[UserFont]
- and al,al
- jz .done
- mov al,[VGAFontSize]
- pm_call pm_userfont
- mov P_ES,es
- mov P_BX,bx
-
-.done: ; CF=0 here
- mov P_AL,al
- ret
-
-;
-; INT 22h AX=0019h Read disk
-;
-%if IS_SYSLINUX || IS_ISOLINUX || IS_EXTLINUX
-comapi_readdisk:
- cmp P_EDI,0 ; Reserved for future expansion
- jnz .err
- mov eax,P_EDX
- mov edx,P_ESI
- mov es,P_ES
- mov bx,P_BX
- mov bp,P_CX ; WE CANNOT use P_* after touching bp!
- call getlinsec
- clc
- ret
-.err:
- stc
- ret
-%else
-comapi_readdisk equ comapi_err
-%endif
-
-;
-; INT 22h AX=001Ah Obsolete
-;
-
-;
-; INT 22h AX=001Bh Obsolete
-;
-
-;
-; INT 22h AX=001Ch Get pointer to auxillary data vector
-;
-comapi_getadv:
- mov P_ES,ds
- mov P_BX,adv0.data
- mov P_CX,ADV_LEN
- ret
-
-;
-; INT 22h AX=001Dh Write auxillary data vector
-;
-comapi_writeadv equ adv_write
-
-;
-; INT 22h AX=001Eh Keyboard remapping table
-comapi_kbdtable:
- cmp P_DX,0
- jne .err
- mov P_AX,1 ; Version
- mov P_CX,256 ; Length
- mov P_ES,cs
- mov P_BX,KbdMap
- ret
-.err:
- stc
- ret
-
-;
-; INT 22h AX=001Fh Get current working directory
-;
-comapi_getcwd:
- mov P_ES,cs
- mov P_BX,CurrentDirName
- clc
- ret
-
-;
-; INT 22h AX=0023h Query shuffler size
-;
-comapi_shufsize:
- ; +15 is padding to guarantee alignment
- mov P_CX,__bcopyxx_len + 15
- ret
-
-;
-; INT 22h AX=0024h Cleanup, shuffle and boot raw
-;
-comapi_shufraw:
- call comapi_cleanup
mov edi,P_EDI
mov esi,P_ESI
mov ecx,P_ECX
@@ -723,62 +386,44 @@ comapi_initadv:
section .data16
-%macro int21 2
- db %1
- dw %2
-%endmacro
-
-int21_table:
- int21 00h, comboot_return
- int21 01h, comboot_getkey
- int21 02h, comboot_writechr
- int21 04h, comboot_writeserial
- int21 08h, comboot_getkeynoecho
- int21 09h, comboot_writestr
- int21 0Bh, comboot_checkkey
- int21 30h, comboot_checkver
- int21 4Ch, comboot_return
- int21 -1, comboot_bad_int21
-int21_count equ ($-int21_table)/3
-
alignz 2
int22_table:
dw comapi_err ; 0000 unimplemented syscall
- dw comapi_get_version ; 0001 get SYSLINUX version
- dw comapi_writestr ; 0002 write string
- dw comapi_run ; 0003 run specified command
- dw comapi_run_default ; 0004 run default command
- dw comapi_textmode ; 0005 force text mode
- dw comapi_open ; 0006 open file
- dw comapi_read ; 0007 read file
- dw comapi_close ; 0008 close file
- dw comapi_pxecall ; 0009 call PXE stack
+ dw comapi_err ; 0001 get SYSLINUX version
+ dw comapi_err ; 0002 write string
+ dw comapi_err ; 0003 run specified command
+ dw comapi_err ; 0004 run default command
+ dw comapi_err ; 0005 force text mode
+ dw comapi_err ; 0006 open file
+ dw comapi_err ; 0007 read file
+ dw comapi_err ; 0008 close file
+ dw comapi_err ; 0009 call PXE stack
dw comapi_err ; 000A derivative-specific info
- dw comapi_serialcfg ; 000B get serial port config
- dw comapi_cleanup ; 000C perform final cleanup
+ dw comapi_err ; 000B get serial port config
+ dw comapi_err ; 000C perform final cleanup
dw comapi_err ; 000D clean up then bootstrap
- dw comapi_configfile ; 000E get name of config file
- dw comapi_ipappend ; 000F get ipappend strings
- dw comapi_dnsresolv ; 0010 resolve hostname
+ dw comapi_err ; 000E get name of config file
+ dw comapi_err ; 000F get ipappend strings
+ dw comapi_err ; 0010 resolve hostname
dw comapi_err ; 0011 maximum shuffle descriptors
dw comapi_err ; 0012 cleanup, shuffle and boot
- dw comapi_idle ; 0013 idle call
- dw comapi_localboot ; 0014 local boot
- dw comapi_features ; 0015 feature flags
- dw comapi_runkernel ; 0016 run kernel image
- dw comapi_usingvga ; 0017 report video mode change
- dw comapi_userfont ; 0018 query custom font
- dw comapi_readdisk ; 0019 read disk
+ dw comapi_err ; 0013 idle call
+ dw comapi_err ; 0014 local boot
+ dw comapi_err ; 0015 feature flags
+ dw comapi_err ; 0016 run kernel image
+ dw comapi_err ; 0017 report video mode change
+ dw comapi_err ; 0018 query custom font
+ dw comapi_err ; 0019 read disk
dw comapi_err ; 001A cleanup, shuffle and boot to pm
dw comapi_err ; 001B cleanup, shuffle and boot to rm
dw comapi_getadv ; 001C get pointer to ADV
dw comapi_writeadv ; 001D write ADV to disk
- dw comapi_kbdtable ; 001E keyboard remapping table
- dw comapi_getcwd ; 001F get current working directory
+ dw comapi_err ; 001E keyboard remapping table
+ dw comapi_err ; 001F get current working directory
dw comapi_err ; 0020 open directory
dw comapi_err ; 0021 read directory
dw comapi_err ; 0022 close directory
- dw comapi_shufsize ; 0023 query shuffler size
+ dw comapi_err ; 0023 query shuffler size
dw comapi_shufraw ; 0024 cleanup, shuffle and boot raw
dw comapi_initadv ; 0025 initialize adv structure
int22_count equ ($-int22_table)/2
@@ -788,32 +433,14 @@ APIKeyFlag db 0
zero_string db 0 ; Empty, null-terminated string
-;
-; This is the feature flag array for INT 22h AX=0015h
-;
-; Note: PXELINUX clears the idle is noop flag if appropriate
-; in pxe_detect_nic_type
-;
- global feature_flags, feature_flags_len
-feature_flags:
- db 1 ; Have local boot, idle is not noop
-feature_flags_len equ ($-feature_flags)
-
err_notdos db ': attempted DOS system call INT ',0
err_comlarge db 'COMBOOT image too large.', CR, LF, 0
- global VGAFontSize, UserFont
- alignz 2
-VGAFontSize dw 16 ; Defaults to 16 byte font
-UserFont db 0 ; Using a user-specified font
-
section .bss16
alignb 4
DOSErrTramp resd 33 ; Error trampolines
- global ConfigName
-ConfigName resb FILENAME_MAX
%ifndef HAVE_CURRENTDIRNAME
- global CurrentDirName
+ global CurrentDirName:data hidden
CurrentDirName resb FILENAME_MAX
%endif
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