arch/x86_64/sys/syscall_serial.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

#include "jove.h"
#include "lib/printf.h"
#include "sys/syscall.h"
#include "syscall.h"
#include "arch/x86_64/hal/serial_com.h"

static int
s_syscall_serial_write(
        jove_owned_obj_t *serial_com,
        size_t payload_bytes,
        void *payload_data)
{
    size_t bytes_needed = sizeof(struct syscall_generic_write);
    CHECK_TOOSMALL(bytes_needed, payload_bytes, "Message is too small for this syscall!");

    struct syscall_generic_write *payload = payload_data;
    bytes_needed += payload->len * 2;
    CHECK_TOOSMALL(bytes_needed, payload_bytes, "Message is too small for write buffer!");
    
    return serial_com_write(serial_com, payload->data, payload->len);
}

int
_syscall_handle_serial(syscall_context_t *ctx)
{
    switch(ctx->header->callid) {
        case SYSCALL_SERIAL_COM_WRITE:
            return s_syscall_serial_write(ctx->target.obj, ctx->bytes_left, ctx->payload);
        default:
            kprintf("syscall_serial: serial com object does not support syscall %i\n", ctx->header->callid);
            return -EBADCALL;
    }
}