iris/mips.hhp

#pypp 0
#ifndef _ARCH_HH
#define _ARCH_HH

#ifdef ARCH
#define reg_hack(x...) #x
#define cp0_get(reg, target) do { __asm__ volatile ("mfc0 %0, $" reg_hack(reg) : "=r" (target)); } while (0)
#define cp0_set(reg, value) do { __asm__ volatile ("mtc0 %0, $" reg_hack(reg) :: "r" (value)); } while (0)
#define cp0_set0(reg) do { __asm__ volatile ("mtc0 $zero, $" reg_hack(reg)); } while (0)

// cp0 registers.
#define CP0_INDEX 0
#define CP0_RANDOM 1
#define CP0_ENTRY_LO0 2
#define CP0_ENTRY_LO1 3
#define CP0_CONTEXT 4
#define CP0_PAGE_MASK 5
#define CP0_WIRED 6
#define CP0_BAD_V_ADDR 8
#define CP0_COUNT 9
#define CP0_ENTRY_HI 10
#define CP0_COMPARE 11
#define CP0_STATUS 12
#define CP0_CAUSE 13
#define CP0_EPC 14
#define CP0_P_R_ID 15
#define CP0_CONFIG 16
#define CP0_CONFIG1 16, 1
#define CP0_CONFIG2 16, 2
#define CP0_CONFIG3 16, 3
#define CP0_L_L_ADDR 17
#define CP0_WATCH_LO 18
#define CP0_WATCH_HI 19
#define CP0_DEBUG 23
#define CP0_DEPC 24
#define CP0_PERF_CNT 25
#define CP0_ERR_CTL 26
#define CP0_CACHE_ERR 27
#define CP0_TAG_LO 28, 0
#define CP0_DATA_LO 28, 1
#define CP0_TAG_HI 29, 0
#define CP0_DATA_HI 29, 1
#define CP0_ERROR_EPC 30
#define CP0_DESAVE 31
#endif

#define PAGE_BITS (12)
#define PAGE_SIZE (1 << PAGE_BITS)
#define PAGE_MASK (~(PAGE_SIZE - 1))

struct Thread_arch:
	unsigned at, v0, v1, a0, a1, a2, a3
	unsigned t0, t1, t2, t3, t4, t5, t6, t7, t8, t9
	unsigned s0, s1, s2, s3, s4, s5, s6, s7
	unsigned gp, fp, ra, hi, lo, k0, k1

struct Memory_arch:
	unsigned asid
	unsigned **directory

EXTERN unsigned g_asid

// Functions which can be called from assembly must not be mangled.
extern "C":
	// Kernel entry points, called from entry.S.
	Thread *interrupt ()
	Thread *cache_error ()
	Thread *exception ()
	Thread *tlb_refill ()

	#ifdef INIT
	// Initialize most things (the rest is done in boot.S)
	void init ()
	// Start running the idle task for the first time.
	void run_idle (Thread *self)
	#endif

#ifdef INIT
// This is "extern", not "EXTERN", because it really is defined elsewhere.
extern unsigned thread_start[NUM_THREADS + 1]
#endif

#endif