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target/xtensa: support input from chardev console 

Complete xtensa-semi chardev console implementation: allow reading input
characters from file descriptor 0 and call sys_select_one simcall on it.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2018-09-08 19:06:58 -07:00
parent 7a54cfbcee
commit 5aa37f488f
1 changed files with 60 additions and 9 deletions
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69
target/xtensa/xtensa-semi.c
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@ -34,8 +34,6 @@
#include "qemu/log.h"
#include "sysemu/sysemu.h"
static CharBackend *xtensa_sim_console;
enum {
TARGET_SYS_exit = 1,
TARGET_SYS_read = 3,
@ -153,13 +151,48 @@ static uint32_t errno_h2g(int host_errno)
}
}
typedef struct XtensaSimConsole {
CharBackend be;
struct {
char buffer[16];
size_t offset;
} input;
} XtensaSimConsole;
static XtensaSimConsole *sim_console;
static IOCanReadHandler sim_console_can_read;
static int sim_console_can_read(void *opaque)
{
XtensaSimConsole *p = opaque;
return sizeof(p->input.buffer) - p->input.offset;
}
static IOReadHandler sim_console_read;
static void sim_console_read(void *opaque, const uint8_t *buf, int size)
{
XtensaSimConsole *p = opaque;
size_t copy = sizeof(p->input.buffer) - p->input.offset;
if (size < copy) {
copy = size;
}
memcpy(p->input.buffer + p->input.offset, buf, copy);
p->input.offset += copy;
}
void xtensa_sim_open_console(Chardev *chr)
{
static CharBackend console;
static XtensaSimConsole console;
qemu_chr_fe_init(&console, chr, &error_abort);
qemu_chr_fe_set_handlers(&console, NULL, NULL, NULL, NULL, NULL, NULL, true);
xtensa_sim_console = &console;
qemu_chr_fe_init(&console.be, chr, &error_abort);
qemu_chr_fe_set_handlers(&console.be,
sim_console_can_read,
sim_console_read,
NULL, NULL, &console,
NULL, true);
sim_console = &console;
}
void HELPER(simcall)(CPUXtensaState *env)
@ -195,11 +228,27 @@ void HELPER(simcall)(CPUXtensaState *env)
if (buf) {
vaddr += io_sz;
len -= io_sz;
if (fd < 3 && xtensa_sim_console) {
if (fd < 3 && sim_console) {
if (is_write && (fd == 1 || fd == 2)) {
io_done = qemu_chr_fe_write_all(xtensa_sim_console,
io_done = qemu_chr_fe_write_all(&sim_console->be,
buf, io_sz);
regs[3] = errno_h2g(errno);
} else if (!is_write && fd == 0) {
if (sim_console->input.offset) {
io_done = sim_console->input.offset;
if (io_sz < io_done) {
io_done = io_sz;
}
memcpy(buf, sim_console->input.buffer, io_done);
memmove(sim_console->input.buffer,
sim_console->input.buffer + io_done,
sim_console->input.offset - io_done);
sim_console->input.offset -= io_done;
qemu_chr_fe_accept_input(&sim_console->be);
} else {
io_done = -1;
regs[3] = TARGET_EAGAIN;
}
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"%s fd %d is not supported with chardev console\n",
@ -292,9 +341,11 @@ void HELPER(simcall)(CPUXtensaState *env)
tv.tv_sec = (int32_t)tswap32(target_tvv[0]);
tv.tv_usec = (int32_t)tswap32(target_tvv[1]);
}
if (fd < 3 && xtensa_sim_console) {
if (fd < 3 && sim_console) {
if ((fd == 1 || fd == 2) && rq == SELECT_ONE_WRITE) {
regs[2] = 1;
} else if (fd == 0 && rq == SELECT_ONE_READ) {
regs[2] = sim_console->input.offset > 0;
} else {
regs[2] = 0;
}