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kvisc/ka/sys/intr/trap0.k

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; The OS/K Team licenses this file to you under the MIT license.
; See the LICENSE file in the project root for more information.
trap0_handler:
.init:
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mov rcx, .text
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mov rsp, TRAP0_STACK
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jmp TrapHandlers.prolog
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.text:
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call RFS.LoadReg, r14, $rax
call RFS.LoadArgs, r14
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jmp.axz .handle_Shutdown
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b.z rax, Sys.Exit, .handle_Exit
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b.z rax, Sys.FindNext, .handle_FindNext
b.z rax, Sys.FindFirst, .handle_FindFirst
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b.z rax, Sys.OpenFile, .handle_OpenFile
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b.z rax, Sys.CreateFile, .handle_CreateFile
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b.z rax, Sys.CloseFile, .handle_CloseFile
b.z rax, Sys.ReadFile, .handle_ReadFile
b.z rax, Sys.EnterHaltMode, .handle_HaltMode
mov rax, 1 << 63
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.fini.savecx:
mov ax2, rcx
call RFS.StoreReg, r14, $rcx
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.fini:
jmp TrapHandlers.epilog
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;------------------------------------------------;
; Syscall implementations ;
;------------------------------------------------;
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;
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; Pass control to COMMAND.COM in frame 0
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;
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.handle_Exit:
; Open COMMAND.COM
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call DISK.OpenFile, .cmdcom
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; Crash on failure
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cmp rax, zero
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crash.l
; Load at CMDCOM_LOADP
mov ax1, CMDCOM_LOADP
mov ax2, CMDCOM_MAXSZ
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call DISK.ReadFile, rax
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; Assume that COMMAND.COM being
; less then 4KB means something
; went wrong
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b.l rax, 0x1000, abort
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; Close the handle
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call DISK.CloseFile, rax
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; Code address
mov ax2, 0x100000
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call RFS.StoreReg, zero, $rip
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; Usermode
mov ax2, 3
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call RFS.StoreReg, zero, $cr0
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mov rcx, CMDCOM_LOADP
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dec rcx, 0x100000
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; Code offset
mov ax2, rcx
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call RFS.StoreReg, zero, $cr1
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; Data offset
mov ax2, rcx
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call RFS.StoreReg, zero, $cr2
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; Return frame
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mov q[rbp-16], zero
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jmp .fini
.cmdcom = "command.com"
;
; Disk API
;
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.handle_FindFirst:
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inc ax0, r12
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call DISK.FindFirst
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jmp .fini.savecx
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.handle_FindNext:
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inc ax0, r12
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call DISK.FindNext
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jmp .fini.savecx
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.handle_OpenFile:
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inc ax0, r12
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call DISK.OpenFile
jmp .fini
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.handle_CreateFile:
inc ax0, r12
call DISK.CreateFile
jmp .fini
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.handle_CloseFile:
call DISK.CloseFile
jmp .fini
.handle_ReadFile:
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inc ax1, r12
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call DISK.ReadFile
jmp .fini
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;
; Misc.
;
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.handle_Shutdown:
stop
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.handle_HaltMode:
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mov rcx, -1
hlt.rep
stop
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