Revision 74ca317c26a3f8543203b61d262c0ab2e30c384e authored by Vivek Goyal on 29 August 2014, 22:18:46 UTC, committed by Linus Torvalds on 29 August 2014, 23:28:16 UTC
Currently new system call kexec_file_load() and all the associated code compiles if CONFIG_KEXEC=y. But new syscall also compiles purgatory code which currently uses gcc option -mcmodel=large. This option seems to be available only gcc 4.4 onwards. Hiding new functionality behind a new config option will not break existing users of old gcc. Those who wish to enable new functionality will require new gcc. Having said that, I am trying to figure out how can I move away from using -mcmodel=large but that can take a while. I think there are other advantages of introducing this new config option. As this option will be enabled only on x86_64, other arches don't have to compile generic kexec code which will never be used. This new code selects CRYPTO=y and CRYPTO_SHA256=y. And all other arches had to do this for CONFIG_KEXEC. Now with introduction of new config option, we can remove crypto dependency from other arches. Now CONFIG_KEXEC_FILE is available only on x86_64. So whereever I had CONFIG_X86_64 defined, I got rid of that. For CONFIG_KEXEC_FILE, instead of doing select CRYPTO=y, I changed it to "depends on CRYPTO=y". This should be safer as "select" is not recursive. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Tested-by: Shaun Ruffell <sruffell@digium.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent b38af47
ops-loongson3.c
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <asm/mips-boards/bonito64.h>
#include <loongson.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
#define HT1LO_PCICFG_BASE 0x1a000000
#define HT1LO_PCICFG_BASE_TP1 0x1b000000
static int loongson3_pci_config_access(unsigned char access_type,
struct pci_bus *bus, unsigned int devfn,
int where, u32 *data)
{
unsigned char busnum = bus->number;
u_int64_t addr, type;
void *addrp;
int device = PCI_SLOT(devfn);
int function = PCI_FUNC(devfn);
int reg = where & ~3;
addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
if (busnum == 0) {
if (device > 31)
return PCIBIOS_DEVICE_NOT_FOUND;
addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE) | (addr & 0xffff));
type = 0;
} else {
addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE_TP1) | (addr));
type = 0x10000;
}
if (access_type == PCI_ACCESS_WRITE)
writel(*data, addrp);
else {
*data = readl(addrp);
if (*data == 0xffffffff) {
*data = -1;
return PCIBIOS_DEVICE_NOT_FOUND;
}
}
return PCIBIOS_SUCCESSFUL;
}
static int loongson3_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
u32 data = 0;
int ret = loongson3_pci_config_access(PCI_ACCESS_READ,
bus, devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
else if (size == 2)
*val = (data >> ((where & 3) << 3)) & 0xffff;
else
*val = data;
return PCIBIOS_SUCCESSFUL;
}
static int loongson3_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data = 0;
int ret;
if (size == 4)
data = val;
else {
ret = loongson3_pci_config_access(PCI_ACCESS_READ,
bus, devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
if (size == 1)
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else if (size == 2)
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
}
ret = loongson3_pci_config_access(PCI_ACCESS_WRITE,
bus, devfn, where, &data);
return ret;
}
struct pci_ops loongson_pci_ops = {
.read = loongson3_pci_pcibios_read,
.write = loongson3_pci_pcibios_write
};
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