#pypp 0
// Iris: micro-kernel for a capability-based operating system.
// mips/arch.hhp: mips-specific declarations and type definitions.
// Copyright 2009 Bas Wijnen <wijnen@debian.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef _ARCH_HH
#define _ARCH_HH

#ifdef ARCH

#ifndef ASM
#include "board.hh"
#endif

#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_INT_CTL 12, 1
#define CP0_CAUSE 13
#define CP0_EPC 14
#define CP0_P_R_ID 15
#define CP0_EBASE 15, 1
#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

#ifdef __KERNEL__
// register save positions in kThread
#define SAVE_PC (6 * 4)
#define SAVE_SP (SAVE_PC + 4)
#define SAVE_AT (SAVE_SP + 4)
#define SAVE_V (SAVE_AT + 4)
#define SAVE_A (SAVE_V + 2 * 4)
#define SAVE_T (SAVE_A + 4 * 4)
#define SAVE_S (SAVE_T + 10 * 4)
#define SAVE_GP (SAVE_S + 8 * 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_K (SAVE_LO + 4)

#ifndef ASM

void flush_tlb (unsigned asid)
void arch_flush_cache ()

struct kThread_arch:
	unsigned at, v[2], a[4], t[10], s[8], gp, fp, ra, hi, lo, k[2]

// The following is used for page mapping.
// Each Memory has a directory with 0x400 page tables.
// Page tables are pages which contain 0x200 EntryLo. values and 0x200
// kPage 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 kPage_arch:
	kPageP prev_mapped, next_mapped

struct Table:
	unsigned entrylo[0x200]
	kPage *page[0x200]

struct kMemory_arch:
	unsigned asid
	Table **directory
	kPageP *shadow
	unsigned first_table

// Pointers to kMemory when asid is taken, index of next free, or 0, if free.
// asid[0] is used as index to first free asid.
// asid value 0 is only used by the idle task.
EXTERN unsigned asids[64]
EXTERN kReceiverP arch_interrupt_receiver[32]

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

	#ifdef INIT
	// Initialize most things (the rest is done in boot.S)
	void init (unsigned mem)
	void board_init ()
	// Start running the idle task for the first time.
	void run_idle (kThread *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 Table **directory

#endif // not defined ASM

#endif // defined __KERNEL__

#endif