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Added comments about pseudo-supervisor mode.

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This commit is contained in:
Vincent Rivière
2012-10-22 18:17:34 +00:00
parent cbc695294e
commit 8740243650
1 changed files with 3 additions and 0 deletions
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3
BaS_GNU/BaS_GNU/sources/BaS.c
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@@ -165,7 +165,10 @@ void BaS(void)
* (uint8_t *) 0xfffffa11 = 0; * (uint8_t *) 0xfffffa11 = 0;
__asm__ __volatile__("nop \n\t" : : : "memory"); __asm__ __volatile__("nop \n\t" : : : "memory");
/* Test for pseudo-supervisor mode: DIP switch #6 down */
if (DIP_SWITCH & (1 << 7)) { if (DIP_SWITCH & (1 << 7)) {
/* In this mode, the OS actually runs in user mode
* and all the supervisor instructions are emulated. */
__asm__ __volatile__("move.w #0x0700,sr \n\t" : : : "memory"); __asm__ __volatile__("move.w #0x0700,sr \n\t" : : : "memory");
} }
__asm__ __volatile__("jmp 0xe00030 \n\t" : : : "memory"); __asm__ __volatile__("jmp 0xe00030 \n\t" : : : "memory");