u-boot/examples/api/glue.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

429 lines
7.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
*/
#include <common.h>
#include <linux/types.h>
#include <api_public.h>
#include "glue.h"
static int valid_sig(struct api_signature *sig)
{
uint32_t checksum;
struct api_signature s;
if (sig == NULL)
return 0;
/*
* Clear the checksum field (in the local copy) so as to calculate the
* CRC with the same initial contents as at the time when the sig was
* produced
*/
s = *sig;
s.checksum = 0;
checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
if (checksum != sig->checksum)
return 0;
return 1;
}
/*
* Searches for the U-Boot API signature
*
* returns 1/0 depending on found/not found result
*/
int api_search_sig(struct api_signature **sig)
{
unsigned char *sp;
uint32_t search_start = 0;
uint32_t search_end = 0;
if (sig == NULL)
return 0;
if (search_hint == 0)
search_hint = 255 * 1024 * 1024;
search_start = search_hint & ~0x000fffff;
search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN;
sp = (unsigned char *)search_start;
while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) {
if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
*sig = (struct api_signature *)sp;
if (valid_sig(*sig))
return 1;
}
sp += API_SIG_MAGLEN;
}
*sig = NULL;
return 0;
}
/****************************************
*
* console
*
****************************************/
int ub_getc(void)
{
int c;
if (!syscall(API_GETC, NULL, &c))
return -1;
return c;
}
int ub_tstc(void)
{
int t;
if (!syscall(API_TSTC, NULL, &t))
return -1;
return t;
}
void ub_putc(char c)
{
syscall(API_PUTC, NULL, &c);
}
void ub_puts(const char *s)
{
syscall(API_PUTS, NULL, s);
}
/****************************************
*
* system
*
****************************************/
void ub_reset(void)
{
syscall(API_RESET, NULL);
}
static struct mem_region mr[UB_MAX_MR];
static struct sys_info si;
struct sys_info * ub_get_sys_info(void)
{
int err = 0;
memset(&si, 0, sizeof(struct sys_info));
si.mr = mr;
si.mr_no = UB_MAX_MR;
memset(&mr, 0, sizeof(mr));
if (!syscall(API_GET_SYS_INFO, &err, &si))
return NULL;
return ((err) ? NULL : &si);
}
/****************************************
*
* timing
*
****************************************/
void ub_udelay(unsigned long usec)
{
syscall(API_UDELAY, NULL, &usec);
}
unsigned long ub_get_timer(unsigned long base)
{
unsigned long cur;
if (!syscall(API_GET_TIMER, NULL, &cur, &base))
return 0;
return cur;
}
/****************************************************************************
*
* devices
*
* Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1
*
***************************************************************************/
static struct device_info devices[UB_MAX_DEV];
struct device_info * ub_dev_get(int i)
{
return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]);
}
/*
* Enumerates the devices: fills out device_info elements in the devices[]
* array.
*
* returns: number of devices found
*/
int ub_dev_enum(void)
{
struct device_info *di;
int n = 0;
memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV);
di = &devices[0];
if (!syscall(API_DEV_ENUM, NULL, di))
return 0;
while (di->cookie != NULL) {
if (++n >= UB_MAX_DEV)
break;
/* take another device_info */
di++;
/* pass on the previous cookie */
di->cookie = devices[n - 1].cookie;
if (!syscall(API_DEV_ENUM, NULL, di))
return 0;
}
return n;
}
/*
* handle: 0-based id of the device
*
* returns: 0 when OK, err otherwise
*/
int ub_dev_open(int handle)
{
struct device_info *di;
int err = 0;
if (handle < 0 || handle >= UB_MAX_DEV)
return API_EINVAL;
di = &devices[handle];
if (!syscall(API_DEV_OPEN, &err, di))
return -1;
return err;
}
int ub_dev_close(int handle)
{
struct device_info *di;
if (handle < 0 || handle >= UB_MAX_DEV)
return API_EINVAL;
di = &devices[handle];
if (!syscall(API_DEV_CLOSE, NULL, di))
return -1;
return 0;
}
/*
*
* Validates device for read/write, it has to:
*
* - have sane handle
* - be opened
*
* returns: 0/1 accordingly
*/
static int dev_valid(int handle)
{
if (handle < 0 || handle >= UB_MAX_DEV)
return 0;
if (devices[handle].state != DEV_STA_OPEN)
return 0;
return 1;
}
static int dev_stor_valid(int handle)
{
if (!dev_valid(handle))
return 0;
if (!(devices[handle].type & DEV_TYP_STOR))
return 0;
return 1;
}
int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start,
lbasize_t *rlen)
{
struct device_info *di;
lbasize_t act_len;
int err = 0;
if (!dev_stor_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
return API_ESYSC;
if (!err && rlen)
*rlen = act_len;
return err;
}
static int dev_net_valid(int handle)
{
if (!dev_valid(handle))
return 0;
if (devices[handle].type != DEV_TYP_NET)
return 0;
return 1;
}
int ub_dev_recv(int handle, void *buf, int len, int *rlen)
{
struct device_info *di;
int err = 0, act_len;
if (!dev_net_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
return API_ESYSC;
if (!err && rlen)
*rlen = act_len;
return (err);
}
int ub_dev_send(int handle, void *buf, int len)
{
struct device_info *di;
int err = 0;
if (!dev_net_valid(handle))
return API_ENODEV;
di = &devices[handle];
if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
return API_ESYSC;
return err;
}
/****************************************
*
* env vars
*
****************************************/
char * ub_env_get(const char *name)
{
char *value;
if (!syscall(API_ENV_GET, NULL, name, &value))
return NULL;
return value;
}
void ub_env_set(const char *name, char *value)
{
syscall(API_ENV_SET, NULL, name, value);
}
static char env_name[256];
const char * ub_env_enum(const char *last)
{
const char *env, *str;
int i;
env = NULL;
/*
* It's OK to pass only the name piece as last (and not the whole
* 'name=val' string), since the API_ENUM_ENV call uses envmatch()
* internally, which handles such case
*/
if (!syscall(API_ENV_ENUM, NULL, last, &env))
return NULL;
if (!env)
/* no more env. variables to enumerate */
return NULL;
/* next enumerated env var */
memset(env_name, 0, 256);
for (i = 0, str = env; *str != '=' && *str != '\0';)
env_name[i++] = *str++;
env_name[i] = '\0';
return env_name;
}
/****************************************
*
* display
*
****************************************/
int ub_display_get_info(int type, struct display_info *di)
{
int err = 0;
if (!syscall(API_DISPLAY_GET_INFO, &err, type, di))
return API_ESYSC;
return err;
}
int ub_display_draw_bitmap(ulong bitmap, int x, int y)
{
int err = 0;
if (!syscall(API_DISPLAY_DRAW_BITMAP, &err, bitmap, x, y))
return API_ESYSC;
return err;
}
void ub_display_clear(void)
{
syscall(API_DISPLAY_CLEAR, NULL);
}
__weak void *memcpy(void *dest, const void *src, size_t size)
{
unsigned char *dptr = dest;
const unsigned char *ptr = src;
const unsigned char *end = src + size;
while (ptr < end)
*dptr++ = *ptr++;
return dest;
}