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Code Issues Releases Wiki Activity

hwaccess: move x86 port I/O related code into own files

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Allow port I/O related code to be compiled independent from memory
mapping functionality. This enables for a better selection of needed
hardware access types.

Change-Id: I372b4a409f036da766c42bc406b596bc41b0f75a
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/60110
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Thomas Heijligen
2021-12-14 16:36:05 +01:00
committed by Nico Huber
parent 88c871e74c
commit 49d758698a
31 changed files with 122 additions and 82 deletions
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62
hwaccess.c
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@ -25,17 +25,8 @@
#include <fcntl.h>
#endif
#include "flash.h"
#include "programmer.h"
#include "hwaccess.h"
#if USE_IOPERM
#include <sys/io.h>
#endif
#if (defined (__i386__) || defined (__x86_64__) || defined(__amd64__)) && USE_DEV_IO
int io_fd;
#endif
/* Prevent reordering and/or merging of reads/writes to hardware.
* Such reordering and/or merging would break device accesses which depend on the exact access order.
*/
@ -70,59 +61,6 @@ static inline void sync_primitive(void)
#endif
}
#if (defined (__i386__) || defined (__x86_64__) || defined(__amd64__)) && !(defined(__DJGPP__) || defined(__LIBPAYLOAD__))
static int release_io_perms(void *p)
{
#if defined (__sun)
sysi86(SI86V86, V86SC_IOPL, 0);
#elif USE_DEV_IO
close(io_fd);
#elif USE_IOPERM
ioperm(0, 65536, 0);
#elif USE_IOPL
iopl(0);
#endif
return 0;
}
/* Get I/O permissions with automatic permission release on shutdown. */
int rget_io_perms(void)
{
#if defined (__sun)
if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) != 0) {
#elif USE_DEV_IO
if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
#elif USE_IOPERM
if (ioperm(0, 65536, 1) != 0) {
#elif USE_IOPL
if (iopl(3) != 0) {
#endif
msg_perr("ERROR: Could not get I/O privileges (%s).\n", strerror(errno));
msg_perr("You need to be root.\n");
#if defined (__OpenBSD__)
msg_perr("If you are root already please set securelevel=-1 in /etc/rc.securelevel and\n"
"reboot, or reboot into single user mode.\n");
#elif defined(__NetBSD__)
msg_perr("If you are root already please reboot into single user mode or make sure\n"
"that your kernel configuration has the option INSECURE enabled.\n");
#endif
return 1;
} else {
register_shutdown(release_io_perms, NULL);
}
return 0;
}
#else
/* DJGPP and libpayload environments have full PCI port I/O permissions by default. */
/* PCI port I/O support is unimplemented on PPC/MIPS and unavailable on ARM. */
int rget_io_perms(void)
{
return 0;
}
#endif
void mmio_writeb(uint8_t val, void *addr)
{
*(volatile uint8_t *) addr = val;