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api/api.c
14.7 KB
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2007 Semihalf * * Written by: Rafal Jaworowski <raj@semihalf.com> |
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*/ #include <config.h> |
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#include <command.h> #include <common.h> |
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#include <env.h> |
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#include <malloc.h> |
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#include <env_internal.h> |
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#include <linux/types.h> #include <api_public.h> |
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#include <u-boot/crc.h> |
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#include "api_private.h" #define DEBUG #undef DEBUG |
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/***************************************************************************** * * This is the API core. * * API_ functions are part of U-Boot code and constitute the lowest level * calls: * * - they know what values they need as arguments * - their direct return value pertains to the API_ "shell" itself (0 on * success, some error code otherwise) * - if the call returns a value it is buried within arguments * ****************************************************************************/ #ifdef DEBUG #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0) #else #define debugf(fmt, args...) #endif typedef int (*cfp_t)(va_list argp); static int calls_no; /* * pseudo signature: * * int API_getc(int *c) */ static int API_getc(va_list ap) { int *c; |
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if ((c = (int *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; *c = getc(); return 0; } /* * pseudo signature: * * int API_tstc(int *c) */ static int API_tstc(va_list ap) { int *t; |
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if ((t = (int *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; *t = tstc(); return 0; } /* * pseudo signature: * * int API_putc(char *ch) */ static int API_putc(va_list ap) { char *c; |
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if ((c = (char *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; putc(*c); return 0; } /* * pseudo signature: * * int API_puts(char **s) */ static int API_puts(va_list ap) { char *s; |
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if ((s = (char *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; puts(s); return 0; } /* * pseudo signature: * * int API_reset(void) */ static int API_reset(va_list ap) { do_reset(NULL, 0, 0, NULL); /* NOT REACHED */ return 0; } /* * pseudo signature: * * int API_get_sys_info(struct sys_info *si) * * fill out the sys_info struct containing selected parameters about the * machine */ static int API_get_sys_info(va_list ap) { struct sys_info *si; |
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si = (struct sys_info *)va_arg(ap, uintptr_t); |
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if (si == NULL) return API_ENOMEM; return (platform_sys_info(si)) ? 0 : API_ENODEV; } /* * pseudo signature: * * int API_udelay(unsigned long *udelay) */ static int API_udelay(va_list ap) { unsigned long *d; |
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if ((d = (unsigned long *)va_arg(ap, unsigned long)) == NULL) |
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return API_EINVAL; udelay(*d); return 0; } /* * pseudo signature: * * int API_get_timer(unsigned long *current, unsigned long *base) */ static int API_get_timer(va_list ap) { unsigned long *base, *cur; |
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cur = (unsigned long *)va_arg(ap, unsigned long); |
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if (cur == NULL) return API_EINVAL; |
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base = (unsigned long *)va_arg(ap, unsigned long); |
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if (base == NULL) return API_EINVAL; *cur = get_timer(*base); return 0; } /***************************************************************************** * * pseudo signature: * * int API_dev_enum(struct device_info *) * * * cookies uniqely identify the previously enumerated device instance and * provide a hint for what to inspect in current enum iteration: * * - net: ð_device struct address from list pointed to by eth_devices * |
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* - storage: struct blk_desc struct address from &ide_dev_desc[n], |
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* &scsi_dev_desc[n] and similar tables * ****************************************************************************/ static int API_dev_enum(va_list ap) { struct device_info *di; /* arg is ptr to the device_info struct we are going to fill out */ |
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di = (struct device_info *)va_arg(ap, uintptr_t); |
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if (di == NULL) return API_EINVAL; if (di->cookie == NULL) { /* start over - clean up enumeration */ dev_enum_reset(); /* XXX shouldn't the name contain 'stor'? */ debugf("RESTART ENUM "); |
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/* net device enumeration first */ if (dev_enum_net(di)) return 0; } /* * The hidden assumption is there can only be one active network * device and it is identified upon enumeration (re)start, so there's * no point in trying to find network devices in other cases than the * (re)start and hence the 'next' device can only be storage */ if (!dev_enum_storage(di)) /* make sure we mark there are no more devices */ di->cookie = NULL; return 0; } static int API_dev_open(va_list ap) { struct device_info *di; int err = 0; /* arg is ptr to the device_info struct */ |
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di = (struct device_info *)va_arg(ap, uintptr_t); |
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if (di == NULL) return API_EINVAL; /* Allow only one consumer of the device at a time */ if (di->state == DEV_STA_OPEN) return API_EBUSY; if (di->cookie == NULL) return API_ENODEV; if (di->type & DEV_TYP_STOR) err = dev_open_stor(di->cookie); else if (di->type & DEV_TYP_NET) err = dev_open_net(di->cookie); else err = API_ENODEV; if (!err) di->state = DEV_STA_OPEN; return err; } static int API_dev_close(va_list ap) { struct device_info *di; int err = 0; /* arg is ptr to the device_info struct */ |
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di = (struct device_info *)va_arg(ap, uintptr_t); |
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if (di == NULL) return API_EINVAL; if (di->state == DEV_STA_CLOSED) return 0; if (di->cookie == NULL) return API_ENODEV; if (di->type & DEV_TYP_STOR) err = dev_close_stor(di->cookie); else if (di->type & DEV_TYP_NET) err = dev_close_net(di->cookie); else /* * In case of unknown device we cannot change its state, so * only return error code */ err = API_ENODEV; if (!err) di->state = DEV_STA_CLOSED; return err; } /* |
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* pseudo signature: * * int API_dev_write( * struct device_info *di, * void *buf, |
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* int *len, * unsigned long *start |
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* ) * * buf: ptr to buffer from where to get the data to send * |
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* len: ptr to length to be read * - network: len of packet to be sent (in bytes) * - storage: # of blocks to write (can vary in size depending on define) |
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* |
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* start: ptr to start block (only used for storage devices, ignored for * network) |
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*/ static int API_dev_write(va_list ap) { struct device_info *di; void *buf; |
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lbasize_t *len_stor, act_len_stor; lbastart_t *start; int *len_net; |
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int err = 0; /* 1. arg is ptr to the device_info struct */ |
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di = (struct device_info *)va_arg(ap, uintptr_t); |
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if (di == NULL) return API_EINVAL; /* XXX should we check if device is open? i.e. the ->state ? */ if (di->cookie == NULL) return API_ENODEV; /* 2. arg is ptr to buffer from where to get data to write */ |
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buf = (void *)va_arg(ap, uintptr_t); |
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if (buf == NULL) return API_EINVAL; |
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if (di->type & DEV_TYP_STOR) { /* 3. arg - ptr to var with # of blocks to write */ len_stor = (lbasize_t *)va_arg(ap, uintptr_t); if (!len_stor) return API_EINVAL; if (*len_stor <= 0) return API_EINVAL; /* 4. arg - ptr to var with start block */ start = (lbastart_t *)va_arg(ap, uintptr_t); act_len_stor = dev_write_stor(di->cookie, buf, *len_stor, *start); if (act_len_stor != *len_stor) { debugf("write @ %llu: done %llu out of %llu blocks", (uint64_t)blk, (uint64_t)act_len_stor, (uint64_t)len_stor); return API_EIO; } } else if (di->type & DEV_TYP_NET) { /* 3. arg points to the var with length of packet to write */ len_net = (int *)va_arg(ap, uintptr_t); if (!len_net) return API_EINVAL; if (*len_net <= 0) return API_EINVAL; err = dev_write_net(di->cookie, buf, *len_net); } else |
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err = API_ENODEV; return err; } /* * pseudo signature: * * int API_dev_read( * struct device_info *di, * void *buf, * size_t *len, * unsigned long *start * size_t *act_len * ) * * buf: ptr to buffer where to put the read data * * len: ptr to length to be read * - network: len of packet to read (in bytes) * - storage: # of blocks to read (can vary in size depending on define) * * start: ptr to start block (only used for storage devices, ignored for * network) * * act_len: ptr to where to put the len actually read */ static int API_dev_read(va_list ap) { struct device_info *di; void *buf; lbasize_t *len_stor, *act_len_stor; lbastart_t *start; int *len_net, *act_len_net; /* 1. arg is ptr to the device_info struct */ |
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di = (struct device_info *)va_arg(ap, uintptr_t); |
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if (di == NULL) return API_EINVAL; /* XXX should we check if device is open? i.e. the ->state ? */ if (di->cookie == NULL) return API_ENODEV; /* 2. arg is ptr to buffer from where to put the read data */ |
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buf = (void *)va_arg(ap, uintptr_t); |
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if (buf == NULL) return API_EINVAL; if (di->type & DEV_TYP_STOR) { /* 3. arg - ptr to var with # of blocks to read */ |
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len_stor = (lbasize_t *)va_arg(ap, uintptr_t); |
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if (!len_stor) return API_EINVAL; if (*len_stor <= 0) return API_EINVAL; /* 4. arg - ptr to var with start block */ |
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start = (lbastart_t *)va_arg(ap, uintptr_t); |
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/* 5. arg - ptr to var where to put the len actually read */ |
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act_len_stor = (lbasize_t *)va_arg(ap, uintptr_t); |
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if (!act_len_stor) return API_EINVAL; *act_len_stor = dev_read_stor(di->cookie, buf, *len_stor, *start); } else if (di->type & DEV_TYP_NET) { /* 3. arg points to the var with length of packet to read */ |
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len_net = (int *)va_arg(ap, uintptr_t); |
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if (!len_net) return API_EINVAL; if (*len_net <= 0) return API_EINVAL; /* 4. - ptr to var where to put the len actually read */ |
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act_len_net = (int *)va_arg(ap, uintptr_t); |
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if (!act_len_net) return API_EINVAL; *act_len_net = dev_read_net(di->cookie, buf, *len_net); } else return API_ENODEV; return 0; } /* * pseudo signature: * * int API_env_get(const char *name, char **value) * * name: ptr to name of env var */ static int API_env_get(va_list ap) { char *name, **value; |
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if ((name = (char *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; |
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if ((value = (char **)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; |
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*value = env_get(name); |
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return 0; } /* * pseudo signature: * * int API_env_set(const char *name, const char *value) * * name: ptr to name of env var * * value: ptr to value to be set */ static int API_env_set(va_list ap) { char *name, *value; |
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if ((name = (char *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; |
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if ((value = (char *)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; |
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env_set(name, value); |
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return 0; } /* * pseudo signature: * * int API_env_enum(const char *last, char **next) * * last: ptr to name of env var found in last iteration */ static int API_env_enum(va_list ap) { |
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int i, buflen; char *last, **next, *s; |
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struct env_entry *match, search; |
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static char *var; |
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last = (char *)va_arg(ap, unsigned long); |
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if ((next = (char **)va_arg(ap, uintptr_t)) == NULL) |
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return API_EINVAL; |
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if (last == NULL) { var = NULL; i = 0; } else { var = strdup(last); s = strchr(var, '='); if (s != NULL) *s = 0; search.key = var; |
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i = hsearch_r(search, ENV_FIND, &match, &env_htab, 0); |
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if (i == 0) { i = API_EINVAL; goto done; |
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} } |
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/* match the next entry after i */ i = hmatch_r("", i, &match, &env_htab); if (i == 0) goto done; buflen = strlen(match->key) + strlen(match->data) + 2; var = realloc(var, buflen); snprintf(var, buflen, "%s=%s", match->key, match->data); *next = var; |
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return 0; |
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done: free(var); var = NULL; *next = NULL; return i; |
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} |
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/* * pseudo signature: * * int API_display_get_info(int type, struct display_info *di) */ static int API_display_get_info(va_list ap) { int type; struct display_info *di; type = va_arg(ap, int); di = va_arg(ap, struct display_info *); return display_get_info(type, di); } /* * pseudo signature: * * int API_display_draw_bitmap(ulong bitmap, int x, int y) */ static int API_display_draw_bitmap(va_list ap) { ulong bitmap; int x, y; bitmap = va_arg(ap, ulong); x = va_arg(ap, int); y = va_arg(ap, int); return display_draw_bitmap(bitmap, x, y); } /* * pseudo signature: * * void API_display_clear(void) */ static int API_display_clear(va_list ap) { display_clear(); return 0; } |
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static cfp_t calls_table[API_MAXCALL] = { NULL, }; /* * The main syscall entry point - this is not reentrant, only one call is * serviced until finished. * * e.g. syscall(1, int *, u_int32_t, u_int32_t, u_int32_t, u_int32_t); |
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* |
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* call: syscall number * * retval: points to the return value placeholder, this is the place the * syscall puts its return value, if NULL the caller does not * expect a return value * * ... syscall arguments (variable number) * * returns: 0 if the call not found, 1 if serviced */ int syscall(int call, int *retval, ...) { va_list ap; int rv; |
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if (call < 0 || call >= calls_no) { |
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debugf("invalid call #%d ", call); return 0; } if (calls_table[call] == NULL) { debugf("syscall #%d does not have a handler ", call); return 0; } va_start(ap, retval); rv = calls_table[call](ap); if (retval != NULL) *retval = rv; return 1; } void api_init(void) { |
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struct api_signature *sig; |
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/* TODO put this into linker set one day... */ calls_table[API_RSVD] = NULL; calls_table[API_GETC] = &API_getc; calls_table[API_PUTC] = &API_putc; calls_table[API_TSTC] = &API_tstc; calls_table[API_PUTS] = &API_puts; calls_table[API_RESET] = &API_reset; calls_table[API_GET_SYS_INFO] = &API_get_sys_info; calls_table[API_UDELAY] = &API_udelay; calls_table[API_GET_TIMER] = &API_get_timer; calls_table[API_DEV_ENUM] = &API_dev_enum; calls_table[API_DEV_OPEN] = &API_dev_open; calls_table[API_DEV_CLOSE] = &API_dev_close; calls_table[API_DEV_READ] = &API_dev_read; calls_table[API_DEV_WRITE] = &API_dev_write; calls_table[API_ENV_GET] = &API_env_get; calls_table[API_ENV_SET] = &API_env_set; calls_table[API_ENV_ENUM] = &API_env_enum; |
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calls_table[API_DISPLAY_GET_INFO] = &API_display_get_info; calls_table[API_DISPLAY_DRAW_BITMAP] = &API_display_draw_bitmap; calls_table[API_DISPLAY_CLEAR] = &API_display_clear; |
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calls_no = API_MAXCALL; debugf("API initialized with %d calls ", calls_no); dev_stor_init(); /* * Produce the signature so the API consumers can find it */ sig = malloc(sizeof(struct api_signature)); if (sig == NULL) { printf("API: could not allocate memory for the signature! "); return; } |
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env_set_hex("api_address", (unsigned long)sig); |
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debugf("API sig @ 0x%lX ", (unsigned long)sig); |
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memcpy(sig->magic, API_SIG_MAGIC, 8); sig->version = API_SIG_VERSION; sig->syscall = &syscall; sig->checksum = 0; sig->checksum = crc32(0, (unsigned char *)sig, sizeof(struct api_signature)); |
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debugf("syscall entry: 0x%lX ", (unsigned long)sig->syscall); |
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} void platform_set_mr(struct sys_info *si, unsigned long start, unsigned long size, int flags) { int i; if (!si->mr || !size || (flags == 0)) return; |
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/* find free slot */ for (i = 0; i < si->mr_no; i++) if (si->mr[i].flags == 0) { /* insert new mem region */ si->mr[i].start = start; si->mr[i].size = size; si->mr[i].flags = flags; return; } } |