[flashrom] [PATCH 3/3] Refine physical address mapping of flash chips.
Stefan Tauner
stefan.tauner at alumni.tuwien.ac.at
Fri Aug 8 16:25:09 CEST 2014
Previously we did map the physical memory corresponding to all chips,
even for SPI chips where it is completely unnecessary because we do
not use it in any SPI-capable programmer.
Also, the mapping was never undone before the program exited.
Mapping of additional flash registers was done within probing methods
instead of centrally.
Besides all of that, this patch also adds proper error handling for
mapping-related operations.
Signed-off-by: Stefan Tauner <stefan.tauner at alumni.tuwien.ac.at>
---
82802ab.c | 2 --
flash.h | 1 -
flashrom.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++----------------
jedec.c | 6 -----
4 files changed, 63 insertions(+), 30 deletions(-)
diff --git a/82802ab.c b/82802ab.c
index 70c6af0..5d015ba 100644
--- a/82802ab.c
+++ b/82802ab.c
@@ -83,8 +83,6 @@ int probe_82802ab(struct flashctx *flash)
if (id1 != flash->chip->manufacture_id || id2 != flash->chip->model_id)
return 0;
- if (flash->chip->feature_bits & FEATURE_REGISTERMAP)
- map_flash_registers(flash);
return 1;
}
diff --git a/flash.h b/flash.h
index 82a8b74..998696c 100644
--- a/flash.h
+++ b/flash.h
@@ -252,7 +252,6 @@ void tolower_string(char *str);
/* flashrom.c */
extern const char flashrom_version[];
extern const char *chip_to_probe;
-void map_flash_registers(struct flashctx *flash);
int read_memmapped(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
int erase_flash(struct flashctx *flash);
int probe_flash(struct registered_master *mst, int startchip, struct flashctx *fill_flash, int force);
diff --git a/flashrom.c b/flashrom.c
index 0ff6b63..72bf157 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -528,12 +528,23 @@ void programmer_delay(unsigned int usecs)
programmer_table[programmer].delay(usecs);
}
-void map_flash_registers(struct flashctx *flash)
+static int map_flash_registers(struct flashctx *flash)
{
size_t size = flash->chip->total_size * 1024;
/* Flash registers live 4 MByte below the flash. */
- /* FIXME: This is incorrect for nonstandard flashbase. */
- flash->virtual_registers = (chipaddr)programmer_map_flash_region("flash chip registers", (0xFFFFFFFF - 0x400000 - size + 1), size);
+ uintptr_t base = (flashbase != 0) ? flashbase : (0xffffffff - size + 1);
+ if (base < 0x400000) {
+ msg_perr("Base address is too low to map flash registers.");
+ return 1;
+ }
+ base -= 0x400000;
+ void *addr = programmer_map_flash_region("flash chip registers", base, size);
+ if (addr == ERROR_PTR) {
+ msg_perr("Could not map flash chip registers.\n");
+ return 1;
+ }
+ flash->virtual_registers = (chipaddr)addr;
+ return 0;
}
int read_memmapped(struct flashctx *flash, uint8_t *buf, unsigned int start,
@@ -1052,12 +1063,49 @@ unsigned int count_max_decode_exceedings(struct flashctx *flash)
return limitexceeded;
}
+void unmap_flash(struct flashctx *flash)
+{
+ if (flash->chip->bustype & (BUS_PARALLEL | BUS_LPC | BUS_FWH)) {
+ if (flash->virtual_memory != 0) {
+ programmer_unmap_flash_region((void *)flash->virtual_memory,
+ flash->chip->total_size * 1024);
+ flash->virtual_memory = 0;
+ }
+
+ if (flash->chip->feature_bits & FEATURE_REGISTERMAP && flash->virtual_registers != 0) {
+ programmer_unmap_flash_region((void *)flash->virtual_registers,
+ flash->chip->total_size * 1024);
+ flash->virtual_registers = 0;
+ }
+ }
+}
+
+int map_flash(struct flashctx *flash)
+{
+ const unsigned long size = flash->chip->total_size;
+ if (flash->chip->bustype & (BUS_PARALLEL | BUS_LPC | BUS_FWH)) {
+ uintptr_t base = flashbase ? flashbase : (0xffffffff - size + 1);
+ void *addr = programmer_map_flash_region("flash chip", base, size);
+ if (addr == ERROR_PTR) {
+ msg_perr("Could not map flash chip registers.\n");
+ return 1;
+ }
+ flash->virtual_memory = (chipaddr)addr;
+
+ if (flash->chip->feature_bits & FEATURE_REGISTERMAP) {
+ if (map_flash_registers(flash) != 0) {
+ unmap_flash(flash);
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
int probe_flash(struct registered_master *mst, int startchip, struct flashctx *flash, int force)
{
const struct flashchip *chip;
- unsigned long base = 0;
- char location[64];
- uint32_t size;
enum chipbustype buses_common;
char *tmp;
@@ -1082,9 +1130,8 @@ int probe_flash(struct registered_master *mst, int startchip, struct flashctx *f
memcpy(flash->chip, chip, sizeof(struct flashchip));
flash->mst = mst;
- size = chip->total_size * 1024;
- base = flashbase ? flashbase : (0xffffffff - size + 1);
- flash->virtual_memory = (chipaddr)programmer_map_flash_region("flash chip", base, size);
+ if (map_flash(flash) != 0)
+ return -1;
/* We handle a forced match like a real match, we just avoid probing. Note that probe_flash()
* is only called with force=1 after normal probing failed.
@@ -1133,8 +1180,7 @@ int probe_flash(struct registered_master *mst, int startchip, struct flashctx *f
break;
/* Not the first flash chip detected on this bus, and it's just a generic match. Ignore it. */
notfound:
- programmer_unmap_flash_region((void *)flash->virtual_memory, size);
- flash->virtual_memory = (chipaddr)NULL;
+ unmap_flash(flash);
free(flash->chip);
flash->chip = NULL;
}
@@ -1142,16 +1188,9 @@ notfound:
if (!flash->chip)
return -1;
-#if CONFIG_INTERNAL == 1
- if (programmer_table[programmer].map_flash_region == physmap)
- snprintf(location, sizeof(location), "at physical address 0x%lx", base);
- else
-#endif
- snprintf(location, sizeof(location), "on %s", programmer_table[programmer].name);
-
tmp = flashbuses_to_text(flash->chip->bustype);
- msg_cinfo("%s %s flash chip \"%s\" (%d kB, %s) %s.\n", force ? "Assuming" : "Found",
- flash->chip->vendor, flash->chip->name, flash->chip->total_size, tmp, location);
+ msg_cinfo("%s %s flash chip \"%s\" (%d kB, %s).\n", force ? "Assuming" : "Found",
+ flash->chip->vendor, flash->chip->name, flash->chip->total_size, tmp);
free(tmp);
/* Flash registers will not be mapped if the chip was forced. Lock info
@@ -1872,7 +1911,8 @@ int doit(struct flashctx *flash, int force, const char *filename, int read_it,
flash->chip->unlock(flash);
if (read_it) {
- return read_flash_to_file(flash, filename);
+ ret = read_flash_to_file(flash, filename);
+ goto unmap;
}
oldcontents = malloc(size);
@@ -1991,5 +2031,7 @@ int doit(struct flashctx *flash, int force, const char *filename, int read_it,
out:
free(oldcontents);
free(newcontents);
+unmap:
+ unmap_flash(flash);
return ret;
}
diff --git a/jedec.c b/jedec.c
index 358b850..1345b89 100644
--- a/jedec.c
+++ b/jedec.c
@@ -166,9 +166,6 @@ int probe_jedec_29gl(struct flashctx *flash)
if (man_id != chip->manufacture_id || dev_id != chip->model_id)
return 0;
- if (chip->feature_bits & FEATURE_REGISTERMAP)
- map_flash_registers(flash);
-
return 1;
}
@@ -287,9 +284,6 @@ static int probe_jedec_common(struct flashctx *flash, unsigned int mask)
if (largeid1 != chip->manufacture_id || largeid2 != chip->model_id)
return 0;
- if (chip->feature_bits & FEATURE_REGISTERMAP)
- map_flash_registers(flash);
-
return 1;
}
--
Kind regards, Stefan Tauner
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