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[arch][vax] set a separate interrupt stack and clear some system registers on boot

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This commit is contained in:
Travis Geiselbrecht
2019-10-21 00:59:39 -07:00
parent 23ebd514c1
commit ac7683f84b
1 changed files with 18 additions and 3 deletions
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21
arch/vax/arch.c
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@@ -17,10 +17,10 @@
// initial boot stack that start.S leaves us on
extern uint8_t boot_stack[1024];
static uint8_t irq_stack[512] __ALIGNED(4);
uint32_t SCB[scb_max_index] __ALIGNED(512);
struct vax_pcb pcb;
static uint32_t SCB[scb_max_index] __ALIGNED(512);
static struct vax_pcb pcb;
extern void vax_undefined_exception(void);
extern void vax_exception_table(void);
@@ -62,8 +62,23 @@ void arch_early_init(void) {
}
mtpr((uint32_t)SCB, PR_SCBB);
// point the pcb base register at an initial, empty PCB.
// we'll switch from it later when starting the threading system.
mtpr((uint32_t)&pcb, PR_PCBB);
// set the interrupt stack. currently unused, but set it to something safe for now.
mtpr((uint32_t)irq_stack + sizeof(irq_stack), PR_ISP);
// null out the mmu registers
mtpr(0, PR_MAPEN);
mtpr(0, PR_SBR);
mtpr(0, PR_SLR);
mtpr(0, PR_P0BR);
mtpr(0, PR_P0LR);
mtpr(0, PR_P1BR);
mtpr(0, PR_P1LR);
dump_regs();
}