kernel.h

#ifndef __KERNEL_H__
#define __KERNEL_H__

#include"common.h"

struct sbiret
{
	long error;
	long value;
};

struct trap_frame 
{
	uint32_t ra;
	uint32_t gp;
	uint32_t tp;
	uint32_t t0;
	uint32_t t1;
	uint32_t t2;
	uint32_t t3;
	uint32_t t4;
	uint32_t t5;
	uint32_t t6;
	uint32_t a0;
	uint32_t a1;
	uint32_t a2;
	uint32_t a3;
	uint32_t a4;
	uint32_t a5;
	uint32_t a6;
	uint32_t a7;
	uint32_t s0;
	uint32_t s1;
	uint32_t s2;
	uint32_t s3;
	uint32_t s4;
	uint32_t s5;
	uint32_t s6;
	uint32_t s7;
	uint32_t s8;
	uint32_t s9;
	uint32_t s10;
	uint32_t s11;
	uint32_t sp;
}__attribute__((packed));

#define PROCS_MAX 8

#define PROC_UNUSED 0
#define PROC_RUNNABLE 1
#define PROC_EXITED 2

struct process 
{
	pid_t pid;
	int state;
	vaddr_t sp;
	uint32_t* page_table;
	uint8_t stack[8192];
};

#define SATP_SV32 (1u << 31)
#define PAGE_V (1 << 0)
#define PAGE_R (1 << 1)
#define PAGE_W (1 << 2)
#define PAGE_X (1 << 3)
#define PAGE_U (1 << 4)

#define SSTATUS_SPIE (1 << 5)
#define SSTATUS_SUM (1 << 18)

#define SCAUSE_ECALL 8

#define USER_BASE 0x10000000

paddr_t alloc_pages(uint32_t n);

#define PANIC(fmt, ...) \
	do{ \
	printf("PANIC: %s:%d: " fmt "\n", __FILE__, __LINE__, ##__VA_ARGS__); \
	for(;;); \
	}while(0) 

#define ASSERT(exp) \
	do{ \
		if((exp) == 0) \
			PANIC("Assertion failed: " #exp); \
		else ; \
	}while(0)

#define ASSERT_EQ(LVAL, RVAL) \
	do{ \
	ASSERT((LVAL) == (RVAL)); \
	}while(0)

#define READ_CSR(reg) \
	({ \
	 unsigned long __tmp; \
	 __asm__ __volatile__("csrr %0, " #reg : "=r"(__tmp)); \
	 __tmp; \
	 })

#define WRITE_CSR(reg, value) \
	do { \
		uint32_t __tmp = (value); \
		__asm__ __volatile__("csrw " #reg ", %0" :: "r"(__tmp)); \
	} while(0)

#endif