mirror of
https://gitlab.os-k.eu/os-k-team/kvisc.git
synced 2023-08-25 14:05:46 +02:00
125 lines
2.0 KiB
Plaintext
125 lines
2.0 KiB
Plaintext
; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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trap0_handler:
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.init:
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mov rcx, .text
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mov rbp, TRAP0_STACK
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jmp TrapHandlers.prolog
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.text:
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mov ax0, r12
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mov ax1, $rax
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call RFS.LoadReg
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call RFS.LoadArgs
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b.z rax, Sys.HLT, .handle_HLT
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b.z rax, Sys.Exit, .handle_Exit
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b.z rax, Sys.Shutdown, .handle_Shutdown
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b.z rax, Sys.FindNext, .handle_FindNext
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b.z rax, Sys.FindFirst, .handle_FindFirst
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.fini:
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jmp TrapHandlers.epilog
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;------------------------------------------------;
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; Syscall implementations ;
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;------------------------------------------------;
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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:
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; Open COMMAND.COM
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mov ax0, .cmdcom
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call DISK.OpenFile
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; Crash on failure
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cmp rax, 0
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crash.l
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; Load at CMDCOM_LOADP
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mov ax0, rax
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mov ax1, CMDCOM_LOADP
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mov ax2, CMDCOM_MAXSZ
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call DISK.ReadFile
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; Assume that COMMAND.COM being
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; less then 4KB means something
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; went wrong
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cmp rax, 0x1000
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crash.b
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; Close the handle
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mov ax0, rax
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call DISK.CloseFile
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; Code address
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xor ax0, ax0
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mov ax1, $rip
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mov ax2, 0x100000
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call RFS.StoreReg
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; No flags set
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mov ax1, $rfx
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xor ax2, ax2
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call RFS.StoreReg
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; Usermode
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mov ax1, $cr0
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mov ax2, 3
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call RFS.StoreReg
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mov rcx, CMDCOM_LOADP
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sub rcx, 0x100000
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; Code offset
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mov ax1, $cr1
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mov ax2, rcx
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call RFS.StoreReg
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; Data offset
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mov ax1, $cr2
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mov ax2, rcx
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call RFS.StoreReg
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; Return frame
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mov q[rbp-16], 0
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jmp .fini
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.cmdcom = "command.com"
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;
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; Disk API
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;
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.handle_FindFirst:
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add ax0, nx0
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call DISK.FindFirst
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jmp .fini
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.handle_FindNext:
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add ax0, nx0
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call DISK.FindNext
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jmp .fini
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;
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; Misc.
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;
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.handle_Shutdown:
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stop
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.handle_HLT:
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hlt
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.HLT.loop:
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xpause
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scan rax
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b.z rax, 0, .HLT.loop
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prn rax
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jmp .HLT.loop
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