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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2010-2020, The Regents of the University of California
* (Regents). All Rights Reserved.
*/
#include <sbi/riscv_locks.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_system.h>
#include <sbi_utils/sys/htif.h>
#define HTIF_DATA_BITS 48
#define HTIF_DATA_MASK ((1ULL << HTIF_DATA_BITS) - 1)
#define HTIF_DATA_SHIFT 0
#define HTIF_CMD_BITS 8
#define HTIF_CMD_MASK ((1ULL << HTIF_CMD_BITS) - 1)
#define HTIF_CMD_SHIFT 48
#define HTIF_DEV_BITS 8
#define HTIF_DEV_MASK ((1ULL << HTIF_DEV_BITS) - 1)
#define HTIF_DEV_SHIFT 56
#define HTIF_DEV_SYSTEM 0
#define HTIF_DEV_CONSOLE 1
#define HTIF_CONSOLE_CMD_GETC 0
#define HTIF_CONSOLE_CMD_PUTC 1
#if __riscv_xlen == 64
# define TOHOST_CMD(dev, cmd, payload) \
(((uint64_t)(dev) << HTIF_DEV_SHIFT) | \
((uint64_t)(cmd) << HTIF_CMD_SHIFT) | \
(uint64_t)(payload))
#else
# define TOHOST_CMD(dev, cmd, payload) ({ \
if ((dev) || (cmd)) __builtin_trap(); \
(payload); })
#endif
#define FROMHOST_DEV(fromhost_value) \
((uint64_t)((fromhost_value) >> HTIF_DEV_SHIFT) & HTIF_DEV_MASK)
#define FROMHOST_CMD(fromhost_value) \
((uint64_t)((fromhost_value) >> HTIF_CMD_SHIFT) & HTIF_CMD_MASK)
#define FROMHOST_DATA(fromhost_value) \
((uint64_t)((fromhost_value) >> HTIF_DATA_SHIFT) & HTIF_DATA_MASK)
#define PK_SYS_write 64
volatile uint64_t tohost __attribute__((section(".htif")));
volatile uint64_t fromhost __attribute__((section(".htif")));
static uint64_t *htif_fromhost = NULL;
static uint64_t *htif_tohost = NULL;
static bool htif_custom = false;
static int htif_console_buf;
static spinlock_t htif_lock = SPIN_LOCK_INITIALIZER;
static inline uint64_t __read_tohost(void)
{
return (htif_custom) ? *htif_tohost : tohost;
}
static inline void __write_tohost(uint64_t val)
{
if (htif_custom)
*htif_tohost = val;
else
tohost = val;
}
static inline uint64_t __read_fromhost(void)
{
return (htif_custom) ? *htif_fromhost : fromhost;
}
static inline void __write_fromhost(uint64_t val)
{
if (htif_custom)
*htif_fromhost = val;
else
fromhost = val;
}
static void __check_fromhost()
{
uint64_t fh = __read_fromhost();
if (!fh)
return;
__write_fromhost(0);
/* this should be from the console */
if (FROMHOST_DEV(fh) != HTIF_DEV_CONSOLE)
__builtin_trap();
switch (FROMHOST_CMD(fh)) {
case HTIF_CONSOLE_CMD_GETC:
htif_console_buf = 1 + (uint8_t)FROMHOST_DATA(fh);
break;
case HTIF_CONSOLE_CMD_PUTC:
break;
default:
__builtin_trap();
}
}
static void __set_tohost(uint64_t dev, uint64_t cmd, uint64_t data)
{
while (__read_tohost())
__check_fromhost();
__write_tohost(TOHOST_CMD(dev, cmd, data));
}
static int set_custom_addr(bool custom_addr,
unsigned long custom_fromhost_addr,
unsigned long custom_tohost_addr)
{
if (custom_addr) {
if (htif_custom &&
((custom_fromhost_addr != (unsigned long)htif_fromhost) ||
(custom_tohost_addr != (unsigned long)htif_tohost)))
return SBI_EINVAL;
htif_fromhost = (uint64_t *)custom_fromhost_addr;
htif_tohost = (uint64_t *)custom_tohost_addr;
htif_custom = true;
}
return 0;
}
#if __riscv_xlen == 32
static void do_tohost_fromhost(uint64_t dev, uint64_t cmd, uint64_t data)
{
spin_lock(&htif_lock);
__set_tohost(HTIF_DEV_SYSTEM, cmd, data);
while (1) {
uint64_t fh = __read_fromhost();
if (fh) {
if (FROMHOST_DEV(fh) == HTIF_DEV_SYSTEM &&
FROMHOST_CMD(fh) == cmd) {
__write_fromhost(0);
break;
}
__check_fromhost();
}
}
spin_unlock(&htif_lock);
}
static void htif_putc(char ch)
{
/* HTIF devices are not supported on RV32, so do a proxy write call */
volatile uint64_t magic_mem[8];
magic_mem[0] = PK_SYS_write;
magic_mem[1] = HTIF_DEV_CONSOLE;
magic_mem[2] = (uint64_t)(uintptr_t)&ch;
magic_mem[3] = HTIF_CONSOLE_CMD_PUTC;
do_tohost_fromhost(HTIF_DEV_SYSTEM, 0, (uint64_t)(uintptr_t)magic_mem);
}
#else
static void htif_putc(char ch)
{
spin_lock(&htif_lock);
__set_tohost(HTIF_DEV_CONSOLE, HTIF_CONSOLE_CMD_PUTC, ch);
spin_unlock(&htif_lock);
}
#endif
static int htif_getc(void)
{
int ch;
#if __riscv_xlen == 32
/* HTIF devices are not supported on RV32 */
return -1;
#endif
spin_lock(&htif_lock);
__check_fromhost();
ch = htif_console_buf;
if (ch >= 0) {
htif_console_buf = -1;
__set_tohost(HTIF_DEV_CONSOLE, HTIF_CONSOLE_CMD_GETC, 0);
}
spin_unlock(&htif_lock);
return ch - 1;
}
static struct sbi_console_device htif_console = {
.name = "htif",
.console_putc = htif_putc,
.console_getc = htif_getc
};
int htif_serial_init(bool custom_addr,
unsigned long custom_fromhost_addr,
unsigned long custom_tohost_addr)
{
int rc;
rc = set_custom_addr(custom_addr, custom_fromhost_addr,
custom_tohost_addr);
if (rc)
return rc;
sbi_console_set_device(&htif_console);
return 0;
}
static int htif_system_reset_check(u32 type, u32 reason)
{
return 1;
}
static void htif_system_reset(u32 type, u32 reason)
{
while (1) {
__write_fromhost(0);
__write_tohost(1);
}
}
static struct sbi_system_reset_device htif_reset = {
.name = "htif",
.system_reset_check = htif_system_reset_check,
.system_reset = htif_system_reset
};
int htif_system_reset_init(bool custom_addr,
unsigned long custom_fromhost_addr,
unsigned long custom_tohost_addr)
{
int rc;
rc = set_custom_addr(custom_addr, custom_fromhost_addr,
custom_tohost_addr);
if (rc)
return rc;
sbi_system_reset_add_device(&htif_reset);
return 0;
}
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