d6fa4d5b80
-Add interrupt controller and timer support for qemu virt machine -Switch tty read to irq driven as well
30 lines
967 B
ArmAsm
30 lines
967 B
ArmAsm
/*
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* Copyright (c) 2021 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/asm.h>
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// void m68k_context_switch(struct m68k_context_switch_frame *oldcs, struct m68k_context_switch_frame *newcs);
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FUNCTION(m68k_context_switch)
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movel %sp@+,%d0 // pop PC off the stack
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movel %sp@,%a0 // oldcs
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movel %sp@(4),%a1 // newcs
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// save old state
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movel %sp, %a0@(0) // oldcs.sp
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movel %d0, %a0@(4) // oldcs.pc
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moveml %d2-%d7/%a2-%a6, %a0@(8) // oldcs.<base of callee saved list>
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// load new state
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movel %a1@(0), %sp // newcs.sp
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movel %a1@(4), %sp@- // newcs.pc -> stack
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moveml %a1@(8), %d2-%d7/%a2-%a6 // newcs.<base of callee saved list>
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// return to new PC
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rts
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END_FUNCTION(m68k_context_switch)
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