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))

// register save positions in Thread
#define SAVE_PC (5 * 4)
#define SAVE_SP (SAVE_PC + 4)
#define SAVE_AT (SAVE_SP + 4)
#define SAVE_V0 (SAVE_AT + 4)
#define SAVE_V1 (SAVE_V0 + 4)
#define SAVE_A0 (SAVE_V1 + 4)
#define SAVE_A1 (SAVE_A0 + 4)
#define SAVE_A2 (SAVE_A1 + 4)
#define SAVE_A3 (SAVE_A2 + 4)
#define SAVE_T0 (SAVE_A3 + 4)
#define SAVE_T1 (SAVE_T0 + 4)
#define SAVE_T2 (SAVE_T1 + 4)
#define SAVE_T3 (SAVE_T2 + 4)
#define SAVE_T4 (SAVE_T3 + 4)
#define SAVE_T5 (SAVE_T4 + 4)
#define SAVE_T6 (SAVE_T5 + 4)
#define SAVE_T7 (SAVE_T6 + 4)
#define SAVE_T8 (SAVE_T7 + 4)
#define SAVE_T9 (SAVE_T8 + 4)
#define SAVE_S0 (SAVE_T9 + 4)
#define SAVE_S1 (SAVE_S0 + 4)
#define SAVE_S2 (SAVE_S1 + 4)
#define SAVE_S3 (SAVE_S2 + 4)
#define SAVE_S4 (SAVE_S3 + 4)
#define SAVE_S5 (SAVE_S4 + 4)
#define SAVE_S6 (SAVE_S5 + 4)
#define SAVE_S7 (SAVE_S6 + 4)
#define SAVE_GP (SAVE_S7 + 4)
#define SAVE_FP (SAVE_GP + 4)
#define SAVE_RA (SAVE_FP + 4)
#define SAVE_HI (SAVE_RA + 4)
#define SAVE_LO (SAVE_HI + 4)
#define SAVE_K0 (SAVE_LO + 4)
#define SAVE_K1 (SAVE_K0 + 4)

#ifndef ASM

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

// The following is used for page mapping.
// Each Memory has a two directories with 0x400 entries,
// page tables and mapping page tables.  Mapping page tables are
// pages which contain 0x200 EntryLo. values and 0x200 Page pointers.
// For a virtual address, bits 0-11 are in the physical address,
// bits 12-20 are an index in the page table, bits 21-30
// are an index in the page directory and bit 31 is always 0.

struct arch_page : public Object <arch_page> :
	Page *page
	unsigned mapping
	arch_page *prev_mapped, *next_mapped

struct arch_page_table : public Object <arch_page_table> :
	arch_page *first_page

struct Page_arch:
	arch_page *first_mapped

struct Memory_arch:
	unsigned asid
	unsigned **directory
	arch_page_table **shadow
	arch_page_table *first_page_table

// Pointers to Memory when asid is taken, index of next free, or 0, if free.
// asid[0] is used as index to first free asid.
EXTERN unsigned asids[64]
EXTERN Receiver *arch_interrupt_receiver[8]

// 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

// These are "extern", not "EXTERN", because they really are defined elsewhere.
#ifdef INIT
extern unsigned thread_start[NUM_THREADS + 1]
#endif
// Fast pointer to page directory, for tlb miss events
extern unsigned **directory

#endif // defined ASM

#endif