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//See LICENSE for license details.
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include "platform.h"
#include "encoding.h"
#define CPU_FREQ 65000000
#define XSTR(x) #x
#define STR(x) XSTR(x)
#ifndef VECT_IRQ
#define TRAP_ENTRY trap_entry
#else
#define TRAP_ENTRY vtrap_entry
#endif
extern int main(int argc, char** argv);
extern void TRAP_ENTRY();
unsigned long get_cpu_freq()
{
return CPU_FREQ;
}
unsigned long get_timer_freq()
{
return get_cpu_freq();
}
uint64_t get_timer_value()
{
#if __riscv_xlen == 32
while (1) {
uint32_t hi = read_csr(mcycleh);
uint32_t lo = read_csr(mcycle);
if (hi == read_csr(mcycleh))
return ((uint64_t)hi << 32) | lo;
}
#else
return read_csr(mcycle);
#endif
}
static void uart_init(size_t baud_rate)
{
UART0_REG(UART_REG_DIV) = (get_cpu_freq() / 2) / baud_rate - 1;
UART0_REG(UART_REG_TXCTRL) |= UART_TXEN;
}
#ifdef USE_PLIC
extern void handle_m_ext_interrupt();
#endif
#ifdef USE_M_TIME
extern void handle_m_time_interrupt();
#endif
#ifdef USE_LOCAL_ISR
typedef void (*my_interrupt_function_ptr_t) (void);
extern my_interrupt_function_ptr_t localISR[];
#endif
#ifndef VECT_IRQ
uintptr_t handle_trap(uintptr_t mcause, uintptr_t epc) __attribute__((noinline));
uintptr_t handle_trap(uintptr_t mcause, uintptr_t epc)
{
if (0){
#ifdef USE_PLIC
// External Machine-Level interrupt from PLIC
} else if ((mcause & MCAUSE_INT) && ((mcause & MCAUSE_CAUSE) == IRQ_M_EXT)) {
handle_m_ext_interrupt();
#endif
#ifdef USE_M_TIME
// External Machine-Level interrupt from PLIC
} else if ((mcause & MCAUSE_INT) && ((mcause & MCAUSE_CAUSE) == IRQ_M_TIMER)){
handle_m_time_interrupt();
#endif
#ifdef USE_LOCAL_ISR
} else if (mcause & MCAUSE_INT) {
localISR[mcause & MCAUSE_CAUSE] ();
#endif
}
else {
write(1, "Unhandled Trap:\n", 16);
_exit(1 + mcause);
}
return epc;
}
#endif
#ifdef USE_CLIC
void trap_entry(void) __attribute__((interrupt("SiFive-CLIC-preemptible"), aligned(64)));
void trap_entry(void)
{
unsigned long mcause = read_csr(mcause);
unsigned long mepc = read_csr(mepc);
handle_trap(mcause, mepc);
}
#endif
void _init()
{
#ifndef NO_INIT
uart_init(115200);
puts("core freq at " STR(CPU_FREQ) " Hz\n");
#ifdef USE_CLIC
write_csr(mtvec, ((unsigned long)&trap_entry | MTVEC_CLIC));
#else
write_csr(mtvec, ((unsigned long)&TRAP_ENTRY | MTVEC_VECTORED));
#endif
#endif
}
void _fini()
{
}
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