mirror of
https://github.com/AsahiLinux/u-boot
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6aa652d008
This comment is not true since commit 6215bd4c1f
("api: Use hashtable
function for API_env_enum").
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
426 lines
7 KiB
C
426 lines
7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
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*/
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#include <common.h>
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#include <env.h>
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#include <linux/types.h>
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#include <api_public.h>
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#include <u-boot/crc.h>
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#include "glue.h"
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static int valid_sig(struct api_signature *sig)
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{
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uint32_t checksum;
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struct api_signature s;
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if (sig == NULL)
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return 0;
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/*
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* Clear the checksum field (in the local copy) so as to calculate the
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* CRC with the same initial contents as at the time when the sig was
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* produced
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*/
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s = *sig;
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s.checksum = 0;
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checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
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if (checksum != sig->checksum)
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return 0;
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return 1;
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}
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/*
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* Searches for the U-Boot API signature
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*
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* returns 1/0 depending on found/not found result
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*/
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int api_search_sig(struct api_signature **sig)
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{
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unsigned char *sp;
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uint32_t search_start = 0;
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uint32_t search_end = 0;
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if (sig == NULL)
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return 0;
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if (search_hint == 0)
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search_hint = 255 * 1024 * 1024;
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search_start = search_hint & ~0x000fffff;
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search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN;
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sp = (unsigned char *)search_start;
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while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) {
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if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
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*sig = (struct api_signature *)sp;
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if (valid_sig(*sig))
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return 1;
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}
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sp += API_SIG_MAGLEN;
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}
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*sig = NULL;
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return 0;
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}
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/****************************************
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*
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* console
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*
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****************************************/
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int ub_getc(void)
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{
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int c;
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if (!syscall(API_GETC, NULL, &c))
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return -1;
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return c;
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}
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int ub_tstc(void)
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{
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int t;
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if (!syscall(API_TSTC, NULL, &t))
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return -1;
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return t;
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}
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void ub_putc(char c)
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{
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syscall(API_PUTC, NULL, &c);
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}
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void ub_puts(const char *s)
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{
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syscall(API_PUTS, NULL, s);
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}
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/****************************************
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*
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* system
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*
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****************************************/
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void ub_reset(void)
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{
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syscall(API_RESET, NULL);
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}
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static struct mem_region mr[UB_MAX_MR];
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static struct sys_info si;
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struct sys_info * ub_get_sys_info(void)
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{
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int err = 0;
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memset(&si, 0, sizeof(struct sys_info));
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si.mr = mr;
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si.mr_no = UB_MAX_MR;
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memset(&mr, 0, sizeof(mr));
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if (!syscall(API_GET_SYS_INFO, &err, &si))
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return NULL;
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return ((err) ? NULL : &si);
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}
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/****************************************
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*
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* timing
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*
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****************************************/
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void ub_udelay(unsigned long usec)
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{
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syscall(API_UDELAY, NULL, &usec);
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}
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unsigned long ub_get_timer(unsigned long base)
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{
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unsigned long cur;
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if (!syscall(API_GET_TIMER, NULL, &cur, &base))
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return 0;
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return cur;
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}
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/****************************************************************************
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*
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* devices
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*
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* Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1
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*
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***************************************************************************/
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static struct device_info devices[UB_MAX_DEV];
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struct device_info * ub_dev_get(int i)
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{
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return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]);
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}
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/*
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* Enumerates the devices: fills out device_info elements in the devices[]
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* array.
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*
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* returns: number of devices found
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*/
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int ub_dev_enum(void)
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{
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struct device_info *di;
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int n = 0;
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memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV);
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di = &devices[0];
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if (!syscall(API_DEV_ENUM, NULL, di))
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return 0;
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while (di->cookie != NULL) {
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if (++n >= UB_MAX_DEV)
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break;
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/* take another device_info */
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di++;
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/* pass on the previous cookie */
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di->cookie = devices[n - 1].cookie;
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if (!syscall(API_DEV_ENUM, NULL, di))
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return 0;
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}
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return n;
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}
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/*
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* handle: 0-based id of the device
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*
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* returns: 0 when OK, err otherwise
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*/
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int ub_dev_open(int handle)
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{
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struct device_info *di;
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int err = 0;
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if (handle < 0 || handle >= UB_MAX_DEV)
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return API_EINVAL;
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di = &devices[handle];
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if (!syscall(API_DEV_OPEN, &err, di))
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return -1;
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return err;
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}
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int ub_dev_close(int handle)
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{
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struct device_info *di;
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if (handle < 0 || handle >= UB_MAX_DEV)
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return API_EINVAL;
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di = &devices[handle];
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if (!syscall(API_DEV_CLOSE, NULL, di))
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return -1;
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return 0;
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}
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/*
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*
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* Validates device for read/write, it has to:
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*
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* - have sane handle
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* - be opened
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*
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* returns: 0/1 accordingly
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*/
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static int dev_valid(int handle)
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{
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if (handle < 0 || handle >= UB_MAX_DEV)
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return 0;
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if (devices[handle].state != DEV_STA_OPEN)
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return 0;
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return 1;
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}
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static int dev_stor_valid(int handle)
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{
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if (!dev_valid(handle))
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return 0;
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if (!(devices[handle].type & DEV_TYP_STOR))
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return 0;
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return 1;
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}
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int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start,
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lbasize_t *rlen)
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{
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struct device_info *di;
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lbasize_t act_len;
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int err = 0;
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if (!dev_stor_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
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return API_ESYSC;
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if (!err && rlen)
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*rlen = act_len;
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return err;
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}
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static int dev_net_valid(int handle)
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{
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if (!dev_valid(handle))
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return 0;
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if (devices[handle].type != DEV_TYP_NET)
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return 0;
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return 1;
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}
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int ub_dev_recv(int handle, void *buf, int len, int *rlen)
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{
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struct device_info *di;
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int err = 0, act_len;
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if (!dev_net_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
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return API_ESYSC;
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if (!err && rlen)
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*rlen = act_len;
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return (err);
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}
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int ub_dev_send(int handle, void *buf, int len)
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{
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struct device_info *di;
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int err = 0;
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if (!dev_net_valid(handle))
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return API_ENODEV;
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di = &devices[handle];
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if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
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return API_ESYSC;
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return err;
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}
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/****************************************
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*
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* env vars
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*
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****************************************/
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char * ub_env_get(const char *name)
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{
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char *value;
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if (!syscall(API_ENV_GET, NULL, name, &value))
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return NULL;
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return value;
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}
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void ub_env_set(const char *name, char *value)
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{
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syscall(API_ENV_SET, NULL, name, value);
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}
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static char env_name[256];
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const char * ub_env_enum(const char *last)
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{
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const char *env, *str;
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int i;
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env = NULL;
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if (!syscall(API_ENV_ENUM, NULL, last, &env))
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return NULL;
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if (!env)
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/* no more env. variables to enumerate */
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return NULL;
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/* next enumerated env var */
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memset(env_name, 0, 256);
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for (i = 0, str = env; *str != '=' && *str != '\0';)
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env_name[i++] = *str++;
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env_name[i] = '\0';
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return env_name;
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}
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/****************************************
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*
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* display
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*
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****************************************/
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int ub_display_get_info(int type, struct display_info *di)
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{
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int err = 0;
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if (!syscall(API_DISPLAY_GET_INFO, &err, type, di))
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return API_ESYSC;
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return err;
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}
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int ub_display_draw_bitmap(ulong bitmap, int x, int y)
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{
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int err = 0;
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if (!syscall(API_DISPLAY_DRAW_BITMAP, &err, bitmap, x, y))
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return API_ESYSC;
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return err;
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}
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void ub_display_clear(void)
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{
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syscall(API_DISPLAY_CLEAR, NULL);
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}
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__weak void *memcpy(void *dest, const void *src, size_t size)
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{
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unsigned char *dptr = dest;
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const unsigned char *ptr = src;
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const unsigned char *end = src + size;
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while (ptr < end)
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*dptr++ = *ptr++;
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return dest;
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}
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