[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/devmem.c b/ap/app/busybox/src/miscutils/devmem.c
new file mode 100644
index 0000000..786a21b
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/devmem.c
@@ -0,0 +1,143 @@
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ * Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
+ * Copyright (C) 2008, BusyBox Team. -solar 4/26/08
+ */
+
+//usage:#define devmem_trivial_usage
+//usage: "ADDRESS [WIDTH [VALUE]]"
+//usage:#define devmem_full_usage "\n\n"
+//usage: "Read/write from physical address\n"
+//usage: "\n ADDRESS Address to act upon"
+//usage: "\n WIDTH Width (8/16/...)"
+//usage: "\n VALUE Data to be written"
+
+#include "libbb.h"
+
+int devmem_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int devmem_main(int argc UNUSED_PARAM, char **argv)
+{
+ void *map_base, *virt_addr;
+ uint64_t read_result;
+ uint64_t writeval = writeval; /* for compiler */
+ off_t target;
+ unsigned page_size, mapped_size, offset_in_page;
+ int fd;
+ unsigned width = 8 * sizeof(int);
+
+ /* devmem ADDRESS [WIDTH [VALUE]] */
+// TODO: options?
+// -r: read and output only the value in hex, with 0x prefix
+// -w: write only, no reads before or after, and no output
+// or make this behavior default?
+// Let's try this and see how users react.
+
+ /* ADDRESS */
+ if (!argv[1])
+ bb_show_usage();
+ errno = 0;
+ target = bb_strtoull(argv[1], NULL, 0); /* allows hex, oct etc */
+
+ /* WIDTH */
+ if (argv[2]) {
+ if (isdigit(argv[2][0]) || argv[2][1])
+ width = xatou(argv[2]);
+ else {
+ static const char bhwl[] ALIGN1 = "bhwl";
+ static const uint8_t sizes[] ALIGN1 = {
+ 8 * sizeof(char),
+ 8 * sizeof(short),
+ 8 * sizeof(int),
+ 8 * sizeof(long),
+ 0 /* bad */
+ };
+ width = strchrnul(bhwl, (argv[2][0] | 0x20)) - bhwl;
+ width = sizes[width];
+ }
+ /* VALUE */
+ if (argv[3])
+ writeval = bb_strtoull(argv[3], NULL, 0);
+ } else { /* argv[2] == NULL */
+ /* make argv[3] to be a valid thing to fetch */
+ argv--;
+ }
+ if (errno)
+ bb_show_usage(); /* one of bb_strtouXX failed */
+
+ fd = xopen("/dev/mem", argv[3] ? (O_RDWR | O_SYNC) : (O_RDONLY | O_SYNC));
+ mapped_size = page_size = getpagesize();
+ offset_in_page = (unsigned)target & (page_size - 1);
+ if (offset_in_page + width > page_size) {
+ /* This access spans pages.
+ * Must map two pages to make it possible: */
+ mapped_size *= 2;
+ }
+ map_base = mmap(NULL,
+ mapped_size,
+ argv[3] ? (PROT_READ | PROT_WRITE) : PROT_READ,
+ MAP_SHARED,
+ fd,
+ target & ~(off_t)(page_size - 1));
+ if (map_base == MAP_FAILED)
+ bb_perror_msg_and_die("mmap");
+
+// printf("Memory mapped at address %p.\n", map_base);
+
+ virt_addr = (char*)map_base + offset_in_page;
+
+ if (!argv[3]) {
+ switch (width) {
+ case 8:
+ read_result = *(volatile uint8_t*)virt_addr;
+ break;
+ case 16:
+ read_result = *(volatile uint16_t*)virt_addr;
+ break;
+ case 32:
+ read_result = *(volatile uint32_t*)virt_addr;
+ break;
+ case 64:
+ read_result = *(volatile uint64_t*)virt_addr;
+ break;
+ default:
+ bb_error_msg_and_die("bad width");
+ }
+// printf("Value at address 0x%"OFF_FMT"X (%p): 0x%llX\n",
+// target, virt_addr,
+// (unsigned long long)read_result);
+ /* Zero-padded output shows the width of access just done */
+ printf("0x%0*llX\n", (width >> 2), (unsigned long long)read_result);
+ } else {
+ switch (width) {
+ case 8:
+ *(volatile uint8_t*)virt_addr = writeval;
+// read_result = *(volatile uint8_t*)virt_addr;
+ break;
+ case 16:
+ *(volatile uint16_t*)virt_addr = writeval;
+// read_result = *(volatile uint16_t*)virt_addr;
+ break;
+ case 32:
+ *(volatile uint32_t*)virt_addr = writeval;
+// read_result = *(volatile uint32_t*)virt_addr;
+ break;
+ case 64:
+ *(volatile uint64_t*)virt_addr = writeval;
+// read_result = *(volatile uint64_t*)virt_addr;
+ break;
+ default:
+ bb_error_msg_and_die("bad width");
+ }
+// printf("Written 0x%llX; readback 0x%llX\n",
+// (unsigned long long)writeval,
+// (unsigned long long)read_result);
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ if (munmap(map_base, mapped_size) == -1)
+ bb_perror_msg_and_die("munmap");
+ close(fd);
+ }
+
+ return EXIT_SUCCESS;
+}