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#include <sys/cdefs.h>
#include "encoding.h"
#include "platform.h"
#include "prci_driver.h"
extern void eos_trap_entry();
static void uart_init(size_t baud_rate) {
GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_UART0_MASK;
GPIO_REG(GPIO_IOF_EN) |= IOF0_UART0_MASK;
UART0_REG(UART_REG_DIV) = PRCI_get_cpu_freq() / baud_rate - 1;
UART0_REG(UART_REG_TXCTRL) |= UART_TXEN;
UART0_REG(UART_REG_RXCTRL) |= UART_RXEN;
}
__attribute__((constructor))
void metal_init(void) {
SPI0_REG(SPI_REG_SCKDIV) = 8;
PRCI_use_default_clocks();
PRCI_use_pll(PLL_REFSEL_HFXOSC, 0, 1, 31, 1, -1, -1, -1);
uart_init(115200);
write_csr(mtvec, &eos_trap_entry);
if (read_csr(misa) & (1 << ('F' - 'A'))) { // if F extension is present
write_csr(mstatus, MSTATUS_FS); // allow FPU instructions without trapping
write_csr(fcsr, 0); // initialize rounding mode, undefined at reset
}
}
__attribute__((section(".init")))
void __metal_synchronize_harts() {
}
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