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devmem: add 128-bit width

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Add 128-bit width if the compiler provides the needed type.

function                                             old     new   delta
devmem_main                                          405     464     +59
.rodata                                           109025  109043     +18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 77/0)               Total: 77 bytes

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Aaro Koskinen 2022-08-25 18:47:02 +03:00 committed by Denys Vlasenko
parent 1a1220a5b0
commit d432049f28
1 changed files with 44 additions and 24 deletions
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68
miscutils/devmem.c
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@ -29,7 +29,6 @@ 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;
@ -64,9 +63,6 @@ int devmem_main(int argc UNUSED_PARAM, char **argv)
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--;
@ -96,28 +92,46 @@ int devmem_main(int argc UNUSED_PARAM, char **argv)
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_simple_error_msg_and_die("bad width");
#ifdef __SIZEOF_INT128__
if (width == 128) {
unsigned __int128 rd =
*(volatile unsigned __int128 *)virt_addr;
printf("0x%016llX%016llX\n",
(unsigned long long)(uint64_t)(rd >> 64),
(unsigned long long)(uint64_t)rd
);
} else
#endif
{
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_simple_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);
}
// 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 {
/* parse VALUE */
#ifdef __SIZEOF_INT128__
unsigned __int128 writeval = strtoumax(argv[3], NULL, 0);
#else
uint64_t writeval = bb_strtoull(argv[3], NULL, 0);
#endif
switch (width) {
case 8:
*(volatile uint8_t*)virt_addr = writeval;
@ -135,6 +149,12 @@ int devmem_main(int argc UNUSED_PARAM, char **argv)
*(volatile uint64_t*)virt_addr = writeval;
// read_result = *(volatile uint64_t*)virt_addr;
break;
#ifdef __SIZEOF_INT128__
case 128:
*(volatile unsigned __int128 *)virt_addr = writeval;
// read_result = *(volatile uint64_t*)virt_addr;
break;
#endif
default:
bb_simple_error_msg_and_die("bad width");
}