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examples/api/glue.c
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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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* SPDX-License-Identifier: GPL-2.0+ |
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*/ #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 */ |
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int api_search_sig(struct api_signature **sig) { |
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unsigned char *sp; |
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uint32_t search_start = 0; uint32_t search_end = 0; |
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if (sig == NULL) return 0; |
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if (search_hint == 0) search_hint = 255 * 1024 * 1024; |
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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) { |
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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, (uint32_t)&c)) return -1; return c; } int ub_tstc(void) { int t; if (!syscall(API_TSTC, NULL, (uint32_t)&t)) return -1; return t; } void ub_putc(char c) { syscall(API_PUTC, NULL, (uint32_t)&c); } void ub_puts(const char *s) { syscall(API_PUTS, NULL, (uint32_t)s); } /**************************************** * * system * ****************************************/ void ub_reset(void) { syscall(API_RESET, NULL); } |
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static struct mem_region mr[UB_MAX_MR]; |
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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; |
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si.mr_no = UB_MAX_MR; |
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memset(&mr, 0, sizeof(mr)); if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si)) return NULL; return ((err) ? NULL : &si); } /**************************************** * * timing * ****************************************/ |
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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 * |
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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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static struct device_info devices[UB_MAX_DEV]; |
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struct device_info * ub_dev_get(int i) { |
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return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]); |
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} /* * 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; |
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memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV); |
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di = &devices[0]; if (!syscall(API_DEV_ENUM, NULL, di)) return 0; while (di->cookie != NULL) { |
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if (++n >= UB_MAX_DEV) |
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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; |
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if (handle < 0 || handle >= UB_MAX_DEV) |
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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; |
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if (handle < 0 || handle >= UB_MAX_DEV) |
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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) { |
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if (handle < 0 || handle >= UB_MAX_DEV) |
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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; } |
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int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start, lbasize_t *rlen) |
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{ 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)) |
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return API_ESYSC; |
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if (!err && rlen) *rlen = act_len; |
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return err; |
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} static int dev_net_valid(int handle) { if (!dev_valid(handle)) return 0; if (devices[handle].type != DEV_TYP_NET) return 0; return 1; } |
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int ub_dev_recv(int handle, void *buf, int len, int *rlen) |
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{ 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)) |
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return API_ESYSC; |
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if (!err && rlen) *rlen = act_len; |
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return (err); |
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} 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)) |
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return API_ESYSC; |
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return err; } /**************************************** * * env vars * ****************************************/ char * ub_env_get(const char *name) { char *value; if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value)) return NULL; return value; } void ub_env_set(const char *name, char *value) { syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value); } |
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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, (uint32_t)last, (uint32_t)&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; } |
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/**************************************** * * display * ****************************************/ int ub_display_get_info(int type, struct display_info *di) { int err = 0; if (!syscall(API_DISPLAY_GET_INFO, &err, (uint32_t)type, (uint32_t)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); } |