2 * (C) Copyright 2007 Semihalf
4 * Written by: Rafal Jaworowski <raj@semihalf.com>
6 * SPDX-License-Identifier: GPL-2.0+
13 #include <environment.h>
14 #include <linux/types.h>
15 #include <api_public.h>
17 #include "api_private.h"
22 /*****************************************************************************
24 * This is the API core.
26 * API_ functions are part of U-Boot code and constitute the lowest level
29 * - they know what values they need as arguments
30 * - their direct return value pertains to the API_ "shell" itself (0 on
31 * success, some error code otherwise)
32 * - if the call returns a value it is buried within arguments
34 ****************************************************************************/
37 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
39 #define debugf(fmt, args...)
42 typedef int (*cfp_t)(va_list argp);
49 * int API_getc(int *c)
51 static int API_getc(va_list ap)
55 if ((c = (int *)va_arg(ap, uintptr_t)) == NULL)
65 * int API_tstc(int *c)
67 static int API_tstc(va_list ap)
71 if ((t = (int *)va_arg(ap, uintptr_t)) == NULL)
81 * int API_putc(char *ch)
83 static int API_putc(va_list ap)
87 if ((c = (char *)va_arg(ap, uintptr_t)) == NULL)
97 * int API_puts(char **s)
99 static int API_puts(va_list ap)
103 if ((s = (char *)va_arg(ap, uintptr_t)) == NULL)
113 * int API_reset(void)
115 static int API_reset(va_list ap)
117 do_reset(NULL, 0, 0, NULL);
126 * int API_get_sys_info(struct sys_info *si)
128 * fill out the sys_info struct containing selected parameters about the
131 static int API_get_sys_info(va_list ap)
135 si = (struct sys_info *)va_arg(ap, uintptr_t);
139 return (platform_sys_info(si)) ? 0 : API_ENODEV;
145 * int API_udelay(unsigned long *udelay)
147 static int API_udelay(va_list ap)
151 if ((d = (unsigned long *)va_arg(ap, unsigned long)) == NULL)
161 * int API_get_timer(unsigned long *current, unsigned long *base)
163 static int API_get_timer(va_list ap)
165 unsigned long *base, *cur;
167 cur = (unsigned long *)va_arg(ap, unsigned long);
171 base = (unsigned long *)va_arg(ap, unsigned long);
175 *cur = get_timer(*base);
180 /*****************************************************************************
184 * int API_dev_enum(struct device_info *)
187 * cookies uniqely identify the previously enumerated device instance and
188 * provide a hint for what to inspect in current enum iteration:
190 * - net: ð_device struct address from list pointed to by eth_devices
192 * - storage: struct blk_desc struct address from &ide_dev_desc[n],
193 * &scsi_dev_desc[n] and similar tables
195 ****************************************************************************/
197 static int API_dev_enum(va_list ap)
199 struct device_info *di;
201 /* arg is ptr to the device_info struct we are going to fill out */
202 di = (struct device_info *)va_arg(ap, uintptr_t);
206 if (di->cookie == NULL) {
207 /* start over - clean up enumeration */
208 dev_enum_reset(); /* XXX shouldn't the name contain 'stor'? */
209 debugf("RESTART ENUM\n");
211 /* net device enumeration first */
212 if (dev_enum_net(di))
217 * The hidden assumption is there can only be one active network
218 * device and it is identified upon enumeration (re)start, so there's
219 * no point in trying to find network devices in other cases than the
220 * (re)start and hence the 'next' device can only be storage
222 if (!dev_enum_storage(di))
223 /* make sure we mark there are no more devices */
230 static int API_dev_open(va_list ap)
232 struct device_info *di;
235 /* arg is ptr to the device_info struct */
236 di = (struct device_info *)va_arg(ap, uintptr_t);
240 /* Allow only one consumer of the device at a time */
241 if (di->state == DEV_STA_OPEN)
244 if (di->cookie == NULL)
247 if (di->type & DEV_TYP_STOR)
248 err = dev_open_stor(di->cookie);
250 else if (di->type & DEV_TYP_NET)
251 err = dev_open_net(di->cookie);
256 di->state = DEV_STA_OPEN;
262 static int API_dev_close(va_list ap)
264 struct device_info *di;
267 /* arg is ptr to the device_info struct */
268 di = (struct device_info *)va_arg(ap, uintptr_t);
272 if (di->state == DEV_STA_CLOSED)
275 if (di->cookie == NULL)
278 if (di->type & DEV_TYP_STOR)
279 err = dev_close_stor(di->cookie);
281 else if (di->type & DEV_TYP_NET)
282 err = dev_close_net(di->cookie);
285 * In case of unknown device we cannot change its state, so
286 * only return error code
291 di->state = DEV_STA_CLOSED;
298 * Notice: this is for sending network packets only, as U-Boot does not
299 * support writing to storage at the moment (12.2007)
304 * struct device_info *di,
309 * buf: ptr to buffer from where to get the data to send
311 * len: length of packet to be sent (in bytes)
314 static int API_dev_write(va_list ap)
316 struct device_info *di;
321 /* 1. arg is ptr to the device_info struct */
322 di = (struct device_info *)va_arg(ap, uintptr_t);
326 /* XXX should we check if device is open? i.e. the ->state ? */
328 if (di->cookie == NULL)
331 /* 2. arg is ptr to buffer from where to get data to write */
332 buf = (void *)va_arg(ap, uintptr_t);
336 /* 3. arg is length of buffer */
337 len = (int *)va_arg(ap, uintptr_t);
343 if (di->type & DEV_TYP_STOR)
345 * write to storage is currently not supported by U-Boot:
346 * no storage device implements block_write() method
350 else if (di->type & DEV_TYP_NET)
351 err = dev_write_net(di->cookie, buf, *len);
363 * struct device_info *di,
366 * unsigned long *start
370 * buf: ptr to buffer where to put the read data
372 * len: ptr to length to be read
373 * - network: len of packet to read (in bytes)
374 * - storage: # of blocks to read (can vary in size depending on define)
376 * start: ptr to start block (only used for storage devices, ignored for
379 * act_len: ptr to where to put the len actually read
381 static int API_dev_read(va_list ap)
383 struct device_info *di;
385 lbasize_t *len_stor, *act_len_stor;
387 int *len_net, *act_len_net;
389 /* 1. arg is ptr to the device_info struct */
390 di = (struct device_info *)va_arg(ap, uintptr_t);
394 /* XXX should we check if device is open? i.e. the ->state ? */
396 if (di->cookie == NULL)
399 /* 2. arg is ptr to buffer from where to put the read data */
400 buf = (void *)va_arg(ap, uintptr_t);
404 if (di->type & DEV_TYP_STOR) {
405 /* 3. arg - ptr to var with # of blocks to read */
406 len_stor = (lbasize_t *)va_arg(ap, uintptr_t);
412 /* 4. arg - ptr to var with start block */
413 start = (lbastart_t *)va_arg(ap, uintptr_t);
415 /* 5. arg - ptr to var where to put the len actually read */
416 act_len_stor = (lbasize_t *)va_arg(ap, uintptr_t);
420 *act_len_stor = dev_read_stor(di->cookie, buf, *len_stor, *start);
422 } else if (di->type & DEV_TYP_NET) {
424 /* 3. arg points to the var with length of packet to read */
425 len_net = (int *)va_arg(ap, uintptr_t);
431 /* 4. - ptr to var where to put the len actually read */
432 act_len_net = (int *)va_arg(ap, uintptr_t);
436 *act_len_net = dev_read_net(di->cookie, buf, *len_net);
448 * int API_env_get(const char *name, char **value)
450 * name: ptr to name of env var
452 static int API_env_get(va_list ap)
456 if ((name = (char *)va_arg(ap, uintptr_t)) == NULL)
458 if ((value = (char **)va_arg(ap, uintptr_t)) == NULL)
461 *value = getenv(name);
469 * int API_env_set(const char *name, const char *value)
471 * name: ptr to name of env var
473 * value: ptr to value to be set
475 static int API_env_set(va_list ap)
479 if ((name = (char *)va_arg(ap, uintptr_t)) == NULL)
481 if ((value = (char *)va_arg(ap, uintptr_t)) == NULL)
492 * int API_env_enum(const char *last, char **next)
494 * last: ptr to name of env var found in last iteration
496 static int API_env_enum(va_list ap)
499 char *last, **next, *s;
500 ENTRY *match, search;
503 last = (char *)va_arg(ap, unsigned long);
505 if ((next = (char **)va_arg(ap, uintptr_t)) == NULL)
513 s = strchr(var, '=');
517 i = hsearch_r(search, FIND, &match, &env_htab, 0);
524 /* match the next entry after i */
525 i = hmatch_r("", i, &match, &env_htab);
528 buflen = strlen(match->key) + strlen(match->data) + 2;
529 var = realloc(var, buflen);
530 snprintf(var, buflen, "%s=%s", match->key, match->data);
544 * int API_display_get_info(int type, struct display_info *di)
546 static int API_display_get_info(va_list ap)
549 struct display_info *di;
551 type = va_arg(ap, int);
552 di = va_arg(ap, struct display_info *);
554 return display_get_info(type, di);
560 * int API_display_draw_bitmap(ulong bitmap, int x, int y)
562 static int API_display_draw_bitmap(va_list ap)
567 bitmap = va_arg(ap, ulong);
571 return display_draw_bitmap(bitmap, x, y);
577 * void API_display_clear(void)
579 static int API_display_clear(va_list ap)
585 static cfp_t calls_table[API_MAXCALL] = { NULL, };
588 * The main syscall entry point - this is not reentrant, only one call is
589 * serviced until finished.
591 * e.g. syscall(1, int *, u_int32_t, u_int32_t, u_int32_t, u_int32_t);
593 * call: syscall number
595 * retval: points to the return value placeholder, this is the place the
596 * syscall puts its return value, if NULL the caller does not
597 * expect a return value
599 * ... syscall arguments (variable number)
601 * returns: 0 if the call not found, 1 if serviced
603 int syscall(int call, int *retval, ...)
608 if (call < 0 || call >= calls_no) {
609 debugf("invalid call #%d\n", call);
613 if (calls_table[call] == NULL) {
614 debugf("syscall #%d does not have a handler\n", call);
618 va_start(ap, retval);
619 rv = calls_table[call](ap);
628 struct api_signature *sig = NULL;
630 /* TODO put this into linker set one day... */
631 calls_table[API_RSVD] = NULL;
632 calls_table[API_GETC] = &API_getc;
633 calls_table[API_PUTC] = &API_putc;
634 calls_table[API_TSTC] = &API_tstc;
635 calls_table[API_PUTS] = &API_puts;
636 calls_table[API_RESET] = &API_reset;
637 calls_table[API_GET_SYS_INFO] = &API_get_sys_info;
638 calls_table[API_UDELAY] = &API_udelay;
639 calls_table[API_GET_TIMER] = &API_get_timer;
640 calls_table[API_DEV_ENUM] = &API_dev_enum;
641 calls_table[API_DEV_OPEN] = &API_dev_open;
642 calls_table[API_DEV_CLOSE] = &API_dev_close;
643 calls_table[API_DEV_READ] = &API_dev_read;
644 calls_table[API_DEV_WRITE] = &API_dev_write;
645 calls_table[API_ENV_GET] = &API_env_get;
646 calls_table[API_ENV_SET] = &API_env_set;
647 calls_table[API_ENV_ENUM] = &API_env_enum;
648 calls_table[API_DISPLAY_GET_INFO] = &API_display_get_info;
649 calls_table[API_DISPLAY_DRAW_BITMAP] = &API_display_draw_bitmap;
650 calls_table[API_DISPLAY_CLEAR] = &API_display_clear;
651 calls_no = API_MAXCALL;
653 debugf("API initialized with %d calls\n", calls_no);
658 * Produce the signature so the API consumers can find it
660 sig = malloc(sizeof(struct api_signature));
662 printf("API: could not allocate memory for the signature!\n");
666 setenv_hex("api_address", (unsigned long)sig);
667 debugf("API sig @ 0x%lX\n", (unsigned long)sig);
668 memcpy(sig->magic, API_SIG_MAGIC, 8);
669 sig->version = API_SIG_VERSION;
670 sig->syscall = &syscall;
672 sig->checksum = crc32(0, (unsigned char *)sig,
673 sizeof(struct api_signature));
674 debugf("syscall entry: 0x%lX\n", (unsigned long)sig->syscall);
677 void platform_set_mr(struct sys_info *si, unsigned long start, unsigned long size,
682 if (!si->mr || !size || (flags == 0))
686 for (i = 0; i < si->mr_no; i++)
687 if (si->mr[i].flags == 0) {
688 /* insert new mem region */
689 si->mr[i].start = start;
690 si->mr[i].size = size;
691 si->mr[i].flags = flags;