133 lines
2.3 KiB
Plaintext
133 lines
2.3 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 rsp, 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.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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b.z rax, Sys.OpenFile, .handle_OpenFile
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b.z rax, Sys.CloseFile, .handle_CloseFile
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b.z rax, Sys.ReadFile, .handle_ReadFile
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b.z rax, Sys.EnterHaltMode, .handle_HaltMode
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mov rax, 1 << 63
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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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call DISK.OpenFile, .cmdcom
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; Crash on failure
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cmp rax, zero
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crash.l
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; Load at CMDCOM_LOADP
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mov ax1, CMDCOM_LOADP
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mov ax2, CMDCOM_MAXSZ
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call DISK.ReadFile, rax
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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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call DISK.CloseFile, rax
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; Code address
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mov ax2, 0x100000
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call RFS.StoreReg, zero, $rip
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; Usermode
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mov ax2, 3
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call RFS.StoreReg, zero, $cr0
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mov rcx, CMDCOM_LOADP
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sub rcx, rcx, 0x100000
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; Code offset
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mov ax2, rcx
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call RFS.StoreReg, zero, $cr1
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; Data offset
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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
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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, 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, ax0, nx0
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call DISK.FindNext
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jmp .fini
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.handle_OpenFile:
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add ax0, ax0, nx0
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call DISK.OpenFile
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jmp .fini
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.handle_CloseFile:
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call DISK.CloseFile
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jmp .fini
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.handle_ReadFile:
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add ax1, ax1, nx0
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call DISK.ReadFile
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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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mov nx0, zero
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stop
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.handle_HaltMode:
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hlt
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.HLT.loop:
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pause
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pause
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pause
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scan rax
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b.z rax, zero, .HLT.loop
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prn rax
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jmp .HLT.loop
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