mirror of
https://github.com/AsahiLinux/u-boot
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54841ab50c
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands. Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".
This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:
int main (int argc, char **argv)
{
while (--argc > 0 && **++argv == '-') {
/* ====> */ while (*++*argv) {
switch (**argv) {
case 'd':
debug++;
break;
...
default:
usage ();
}
}
}
...
}
The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell. With the modification, the compiler will prevent this with
an
error: increment of read-only location '*argv'
N.B.: The code above can be trivially rewritten like this:
while (--argc > 0 && **++argv == '-') {
char *arg = *argv;
while (*++arg) {
switch (*arg) {
...
Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
386 lines
9.2 KiB
C
386 lines
9.2 KiB
C
/*
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* (C) Copyright 2003 Stefan Roese, stefan.roese@esd-electronics.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include <pci.h>
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#include <universe.h>
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#define PCI_VENDOR PCI_VENDOR_ID_TUNDRA
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#define PCI_DEVICE PCI_DEVICE_ID_TUNDRA_CA91C042
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typedef struct _UNI_DEV UNI_DEV;
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struct _UNI_DEV {
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int bus;
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pci_dev_t busdevfn;
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UNIVERSE *uregs;
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unsigned int pci_bs;
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};
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static UNI_DEV *dev;
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int universe_init(void)
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{
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int j, result, lastError = 0;
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pci_dev_t busdevfn;
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unsigned int val;
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busdevfn = pci_find_device(PCI_VENDOR, PCI_DEVICE, 0);
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if (busdevfn == -1) {
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puts("No Tundra Universe found!\n");
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return -1;
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}
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/* Lets turn Latency off */
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pci_write_config_dword(busdevfn, 0x0c, 0);
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dev = malloc(sizeof(*dev));
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if (NULL == dev) {
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puts("UNIVERSE: No memory!\n");
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result = -1;
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goto break_20;
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}
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memset(dev, 0, sizeof(*dev));
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dev->busdevfn = busdevfn;
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pci_read_config_dword(busdevfn, PCI_BASE_ADDRESS_1, &val);
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if (val & 1) {
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pci_read_config_dword(busdevfn, PCI_BASE_ADDRESS_0, &val);
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}
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val &= ~0xf;
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dev->uregs = (UNIVERSE *)val;
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debug ("UNIVERSE-Base : %p\n", dev->uregs);
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/* check mapping */
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debug (" Read via mapping, PCI_ID = %08X\n", readl(&dev->uregs->pci_id));
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if (((PCI_DEVICE <<16) | PCI_VENDOR) != readl(&dev->uregs->pci_id)) {
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printf ("UNIVERSE: Cannot read PCI-ID via Mapping: %08x\n",
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readl(&dev->uregs->pci_id));
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result = -1;
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goto break_30;
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}
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debug ("PCI_BS = %08X\n", readl(&dev->uregs->pci_bs));
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dev->pci_bs = readl(&dev->uregs->pci_bs);
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/* turn off windows */
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for (j=0; j <4; j ++) {
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writel(0x00800000, &dev->uregs->lsi[j].ctl);
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writel(0x00800000, &dev->uregs->vsi[j].ctl);
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}
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/*
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* Write to Misc Register
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* Set VME Bus Time-out
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* Arbitration Mode
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* DTACK Enable
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*/
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writel(0x15040000 | (readl(&dev->uregs->misc_ctl) & 0x00020000), &dev->uregs->misc_ctl);
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if (readl(&dev->uregs->misc_ctl) & 0x00020000) {
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debug ("System Controller!\n"); /* test-only */
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} else {
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debug ("Not System Controller!\n"); /* test-only */
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}
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/*
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* Lets turn off interrupts
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*/
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writel(0x00000000,&dev->uregs->lint_en); /* Disable interrupts in the Universe first */
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writel(0x0000FFFF,&dev->uregs->lint_stat); /* Clear Any Pending Interrupts */
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eieio();
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writel(0x0000, &dev->uregs->lint_map0); /* Map all ints to 0 */
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writel(0x0000, &dev->uregs->lint_map1); /* Map all ints to 0 */
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eieio();
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return 0;
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break_30:
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free(dev);
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break_20:
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lastError = result;
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return result;
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}
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/*
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* Create pci slave window (access: pci -> vme)
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*/
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int universe_pci_slave_window(unsigned int pciAddr, unsigned int vmeAddr, int size, int vam, int pms, int vdw)
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{
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int result, i;
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unsigned int ctl = 0;
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if (NULL == dev) {
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result = -1;
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goto exit_10;
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}
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for (i = 0; i < 4; i++) {
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if (0x00800000 == readl(&dev->uregs->lsi[i].ctl))
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break;
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}
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if (i == 4) {
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printf ("universe: No Image available\n");
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result = -1;
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goto exit_10;
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}
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debug ("universe: Using image %d\n", i);
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writel(pciAddr , &dev->uregs->lsi[i].bs);
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writel((pciAddr + size), &dev->uregs->lsi[i].bd);
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writel((vmeAddr - pciAddr), &dev->uregs->lsi[i].to);
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switch (vam & VME_AM_Axx) {
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case VME_AM_A16:
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ctl = 0x00000000;
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break;
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case VME_AM_A24:
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ctl = 0x00010000;
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break;
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case VME_AM_A32:
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ctl = 0x00020000;
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break;
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}
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switch (vam & VME_AM_Mxx) {
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case VME_AM_DATA:
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ctl |= 0x00000000;
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break;
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case VME_AM_PROG:
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ctl |= 0x00008000;
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break;
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}
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if (vam & VME_AM_SUP) {
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ctl |= 0x00001000;
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}
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switch (vdw & VME_FLAG_Dxx) {
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case VME_FLAG_D8:
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ctl |= 0x00000000;
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break;
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case VME_FLAG_D16:
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ctl |= 0x00400000;
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break;
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case VME_FLAG_D32:
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ctl |= 0x00800000;
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break;
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}
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switch (pms & PCI_MS_Mxx) {
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case PCI_MS_MEM:
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ctl |= 0x00000000;
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break;
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case PCI_MS_IO:
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ctl |= 0x00000001;
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break;
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case PCI_MS_CONFIG:
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ctl |= 0x00000002;
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break;
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}
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ctl |= 0x80000000; /* enable */
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writel(ctl, &dev->uregs->lsi[i].ctl);
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debug ("universe: window-addr=%p\n", &dev->uregs->lsi[i].ctl);
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debug ("universe: pci slave window[%d] ctl=%08x\n", i, readl(&dev->uregs->lsi[i].ctl));
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debug ("universe: pci slave window[%d] bs=%08x\n", i, readl(&dev->uregs->lsi[i].bs));
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debug ("universe: pci slave window[%d] bd=%08x\n", i, readl(&dev->uregs->lsi[i].bd));
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debug ("universe: pci slave window[%d] to=%08x\n", i, readl(&dev->uregs->lsi[i].to));
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return 0;
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exit_10:
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return -result;
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}
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/*
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* Create vme slave window (access: vme -> pci)
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*/
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int universe_vme_slave_window(unsigned int vmeAddr, unsigned int pciAddr, int size, int vam, int pms)
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{
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int result, i;
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unsigned int ctl = 0;
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if (NULL == dev) {
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result = -1;
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goto exit_10;
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}
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for (i = 0; i < 4; i++) {
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if (0x00800000 == readl(&dev->uregs->vsi[i].ctl))
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break;
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}
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if (i == 4) {
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printf ("universe: No Image available\n");
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result = -1;
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goto exit_10;
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}
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debug ("universe: Using image %d\n", i);
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writel(vmeAddr , &dev->uregs->vsi[i].bs);
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writel((vmeAddr + size), &dev->uregs->vsi[i].bd);
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writel((pciAddr - vmeAddr), &dev->uregs->vsi[i].to);
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switch (vam & VME_AM_Axx) {
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case VME_AM_A16:
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ctl = 0x00000000;
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break;
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case VME_AM_A24:
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ctl = 0x00010000;
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break;
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case VME_AM_A32:
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ctl = 0x00020000;
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break;
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}
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switch (vam & VME_AM_Mxx) {
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case VME_AM_DATA:
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ctl |= 0x00000000;
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break;
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case VME_AM_PROG:
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ctl |= 0x00800000;
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break;
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}
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if (vam & VME_AM_SUP) {
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ctl |= 0x00100000;
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}
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switch (pms & PCI_MS_Mxx) {
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case PCI_MS_MEM:
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ctl |= 0x00000000;
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break;
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case PCI_MS_IO:
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ctl |= 0x00000001;
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break;
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case PCI_MS_CONFIG:
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ctl |= 0x00000002;
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break;
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}
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ctl |= 0x80f00000; /* enable */
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writel(ctl, &dev->uregs->vsi[i].ctl);
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debug ("universe: window-addr=%p\n", &dev->uregs->vsi[i].ctl);
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debug ("universe: vme slave window[%d] ctl=%08x\n", i, readl(&dev->uregs->vsi[i].ctl));
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debug ("universe: vme slave window[%d] bs=%08x\n", i, readl(&dev->uregs->vsi[i].bs));
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debug ("universe: vme slave window[%d] bd=%08x\n", i, readl(&dev->uregs->vsi[i].bd));
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debug ("universe: vme slave window[%d] to=%08x\n", i, readl(&dev->uregs->vsi[i].to));
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return 0;
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exit_10:
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return -result;
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}
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/*
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* Tundra Universe configuration
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*/
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int do_universe(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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ulong addr1 = 0, addr2 = 0, size = 0, vam = 0, pms = 0, vdw = 0;
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char cmd = 'x';
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/* get parameter */
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if (argc > 1)
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cmd = argv[1][0];
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if (argc > 2)
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addr1 = simple_strtoul(argv[2], NULL, 16);
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if (argc > 3)
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addr2 = simple_strtoul(argv[3], NULL, 16);
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if (argc > 4)
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size = simple_strtoul(argv[4], NULL, 16);
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if (argc > 5)
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vam = simple_strtoul(argv[5], NULL, 16);
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if (argc > 6)
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pms = simple_strtoul(argv[6], NULL, 16);
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if (argc > 7)
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vdw = simple_strtoul(argv[7], NULL, 16);
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switch (cmd) {
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case 'i': /* init */
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universe_init();
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break;
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case 'v': /* vme */
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printf("Configuring Universe VME Slave Window (VME->PCI):\n");
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printf(" vme=%08lx pci=%08lx size=%08lx vam=%02lx pms=%02lx\n",
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addr1, addr2, size, vam, pms);
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universe_vme_slave_window(addr1, addr2, size, vam, pms);
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break;
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case 'p': /* pci */
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printf("Configuring Universe PCI Slave Window (PCI->VME):\n");
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printf(" pci=%08lx vme=%08lx size=%08lx vam=%02lx pms=%02lx vdw=%02lx\n",
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addr1, addr2, size, vam, pms, vdw);
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universe_pci_slave_window(addr1, addr2, size, vam, pms, vdw);
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break;
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default:
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printf("Universe command %s not supported!\n", argv[1]);
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}
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return 0;
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}
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U_BOOT_CMD(
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universe, 8, 1, do_universe,
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"initialize and configure Turndra Universe",
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"init\n"
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" - initialize universe\n"
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"universe vme [vme_addr] [pci_addr] [size] [vam] [pms]\n"
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" - create vme slave window (access: vme->pci)\n"
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"universe pci [pci_addr] [vme_addr] [size] [vam] [pms] [vdw]\n"
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" - create pci slave window (access: pci->vme)\n"
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" [vam] = VMEbus Address-Modifier: 01 -> A16 Address Space\n"
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" 02 -> A24 Address Space\n"
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" 03 -> A32 Address Space\n"
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" 04 -> Supervisor AM Code\n"
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" 10 -> Data AM Code\n"
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" 20 -> Program AM Code\n"
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" [pms] = PCI Memory Space: 01 -> Memory Space\n"
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" 02 -> I/O Space\n"
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" 03 -> Configuration Space\n"
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" [vdw] = VMEbus Maximum Datawidth: 01 -> D8 Data Width\n"
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" 02 -> D16 Data Width\n"
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" 03 -> D32 Data Width"
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);
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