1 /* $NetBSD: cpufunc_asm_arm7tdmi.S,v 1.1 2001/11/10 23:14:09 thorpej Exp $ */
4 * Copyright (c) 2001 John Fremlin
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34 * ARM7TDMI assembly functions for CPU / MMU / TLB specific operations
38 #include <machine/asm.h>
39 __FBSDID("$FreeBSD$");
42 * Functions to set the MMU Translation Table Base register
44 * We need to clean and flush the cache as it uses virtual
45 * addresses that are about to change.
47 ENTRY(arm7tdmi_setttb)
48 mov r1, r0 /* store the TTB in a safe place */
49 mov r2, lr /* ditto with lr */
51 bl _C_LABEL(arm7tdmi_cache_flushID)
54 mcr p15, 0, r1, c2, c0, 0
56 /* If we have updated the TTB we must flush the TLB */
57 bl _C_LABEL(arm7tdmi_tlb_flushID)
59 /* For good measure we will flush the IDC as well */
60 bl _C_LABEL(arm7tdmi_cache_flushID)
67 ENTRY(arm7tdmi_tlb_flushID)
69 mcr p15, 0, r0, c8, c7, 0
72 ENTRY(arm7tdmi_tlb_flushID_SE)
73 mcr p15, 0, r0, c8, c7, 1
79 ENTRY(arm7tdmi_cache_flushID)
82 mcr p15, 0, r0, c7, c7, 0
84 /* Make sure that the pipeline is emptied */
93 * These is the CPU-specific parts of the context switcher cpu_switch()
94 * These functions actually perform the TTB reload.
96 * NOTE: Special calling convention
97 * r1, r4-r13 must be preserved
99 ENTRY(arm7tdmi_context_switch)
100 b _C_LABEL(arm7tdmi_setttb)