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authorAndres Salomon <dilinger@queued.net>2010-06-18 17:46:53 -0400
committerH. Peter Anvin <hpa@linux.intel.com>2010-06-18 14:54:36 -0700
commitfd699c76552bbfa66631f019be415a87dbb08237 (patch)
tree49f136f22fc94230af214f9c9c21a6fc0b7180e1 /arch/x86/kernel
parent7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff)
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x86, olpc: Add support for calling into OpenFirmware
Add support for saving OFW's cif, and later calling into it to run OFW commands. OFW remains resident in memory, living within virtual range 0xff800000 - 0xffc00000. A single page directory entry points to the pgdir that OFW actually uses, so rather than saving the entire page table, we grab and install that one entry permanently in the kernel's page table. This is currently only used by the OLPC XO. Note that this particular calling convention breaks PAE and PAT, and so cannot be used on newer x86 hardware. Signed-off-by: Andres Salomon <dilinger@queued.net> LKML-Reference: <20100618174653.7755a39a@dev.queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/Makefile1
-rw-r--r--arch/x86/kernel/head_32.S6
-rw-r--r--arch/x86/kernel/olpc.c12
-rw-r--r--arch/x86/kernel/olpc_ofw.c104
-rw-r--r--arch/x86/kernel/setup.c6
5 files changed, 122 insertions, 7 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index e77b2208372..0925676266b 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_SCx200) += scx200.o
scx200-y += scx200_32.o
obj-$(CONFIG_OLPC) += olpc.o
+obj-$(CONFIG_OLPC_OPENFIRMWARE) += olpc_ofw.o
obj-$(CONFIG_X86_MRST) += mrst.o
microcode-y := microcode_core.o
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 37c3d4b17d8..ff4c453e13f 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -131,6 +131,12 @@ ENTRY(startup_32)
movsl
1:
+#ifdef CONFIG_OLPC_OPENFIRMWARE
+ /* save OFW's pgdir table for later use when calling into OFW */
+ movl %cr3, %eax
+ movl %eax, pa(olpc_ofw_pgd)
+#endif
+
#ifdef CONFIG_PARAVIRT
/* This is can only trip for a broken bootloader... */
cmpw $0x207, pa(boot_params + BP_version)
diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c
index 8297160c41b..156605281f5 100644
--- a/arch/x86/kernel/olpc.c
+++ b/arch/x86/kernel/olpc.c
@@ -21,10 +21,7 @@
#include <asm/geode.h>
#include <asm/setup.h>
#include <asm/olpc.h>
-
-#ifdef CONFIG_OPEN_FIRMWARE
-#include <asm/ofw.h>
-#endif
+#include <asm/olpc_ofw.h>
struct olpc_platform_t olpc_platform_info;
EXPORT_SYMBOL_GPL(olpc_platform_info);
@@ -188,14 +185,15 @@ err:
}
EXPORT_SYMBOL_GPL(olpc_ec_cmd);
-#ifdef CONFIG_OPEN_FIRMWARE
+#ifdef CONFIG_OLPC_OPENFIRMWARE
static void __init platform_detect(void)
{
size_t propsize;
__be32 rev;
+ void *args[] = { NULL, "board-revision-int", &rev, (void *)4 };
+ void *res[] = { &propsize };
- if (ofw("getprop", 4, 1, NULL, "board-revision-int", &rev, 4,
- &propsize) || propsize != 4) {
+ if (olpc_ofw("getprop", args, res) || propsize != 4) {
printk(KERN_ERR "ofw: getprop call failed!\n");
rev = cpu_to_be32(0);
}
diff --git a/arch/x86/kernel/olpc_ofw.c b/arch/x86/kernel/olpc_ofw.c
new file mode 100644
index 00000000000..469ee438429
--- /dev/null
+++ b/arch/x86/kernel/olpc_ofw.c
@@ -0,0 +1,104 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/olpc_ofw.h>
+
+/* address of OFW callback interface; will be NULL if OFW isn't found */
+static int (*olpc_ofw_cif)(int *);
+
+/* page dir entry containing OFW's pgdir table; filled in by head_32.S */
+u32 olpc_ofw_pgd __initdata;
+
+static DEFINE_SPINLOCK(ofw_lock);
+
+#define MAXARGS 10
+
+void __init setup_olpc_ofw_pgd(void)
+{
+ pgd_t *base, *ofw_pde;
+
+ if (!olpc_ofw_cif)
+ return;
+
+ /* fetch OFW's PDE */
+ base = early_ioremap(olpc_ofw_pgd, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
+ if (!base) {
+ printk(KERN_ERR "failed to remap OFW's pgd - disabling OFW!\n");
+ olpc_ofw_cif = NULL;
+ return;
+ }
+ ofw_pde = &base[OLPC_OFW_PDE_NR];
+
+ /* install OFW's PDE permanently into the kernel's pgtable */
+ set_pgd(&swapper_pg_dir[OLPC_OFW_PDE_NR], *ofw_pde);
+ early_iounmap(base, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
+}
+
+int __olpc_ofw(const char *name, int nr_args, void **args, int nr_res,
+ void **res)
+{
+ int ofw_args[MAXARGS + 3];
+ unsigned long flags;
+ int ret, i, *p;
+
+ BUG_ON(nr_args + nr_res > MAXARGS);
+
+ if (!olpc_ofw_cif)
+ return -EIO;
+
+ ofw_args[0] = (int)name;
+ ofw_args[1] = nr_args;
+ ofw_args[2] = nr_res;
+
+ p = &ofw_args[3];
+ for (i = 0; i < nr_args; i++, p++)
+ *p = (int)args[i];
+
+ /* call into ofw */
+ spin_lock_irqsave(&ofw_lock, flags);
+ ret = olpc_ofw_cif(ofw_args);
+ spin_unlock_irqrestore(&ofw_lock, flags);
+
+ if (!ret) {
+ for (i = 0; i < nr_res; i++, p++)
+ *((int *)res[i]) = *p;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__olpc_ofw);
+
+/* OFW cif _should_ be above this address */
+#define OFW_MIN 0xff000000
+
+/* OFW starts on a 1MB boundary */
+#define OFW_BOUND (1<<20)
+
+void __init olpc_ofw_detect(void)
+{
+ struct olpc_ofw_header *hdr = &boot_params.olpc_ofw_header;
+ unsigned long start;
+
+ /* ensure OFW booted us by checking for "OFW " string */
+ if (hdr->ofw_magic != OLPC_OFW_SIG)
+ return;
+
+ olpc_ofw_cif = (int (*)(int *))hdr->cif_handler;
+
+ if ((unsigned long)olpc_ofw_cif < OFW_MIN) {
+ printk(KERN_ERR "OFW detected, but cif has invalid address 0x%lx - disabling.\n",
+ (unsigned long)olpc_ofw_cif);
+ olpc_ofw_cif = NULL;
+ return;
+ }
+
+ /* determine where OFW starts in memory */
+ start = round_down((unsigned long)olpc_ofw_cif, OFW_BOUND);
+ printk(KERN_INFO "OFW detected in memory, cif @ 0x%lx (reserving top %ldMB)\n",
+ (unsigned long)olpc_ofw_cif, (-start) >> 20);
+ reserve_top_address(-start);
+}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b4ae4acbd03..b008e788320 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -102,6 +102,7 @@
#include <asm/paravirt.h>
#include <asm/hypervisor.h>
+#include <asm/olpc_ofw.h>
#include <asm/percpu.h>
#include <asm/topology.h>
@@ -736,10 +737,15 @@ void __init setup_arch(char **cmdline_p)
/* VMI may relocate the fixmap; do this before touching ioremap area */
vmi_init();
+ /* OFW also may relocate the fixmap */
+ olpc_ofw_detect();
+
early_trap_init();
early_cpu_init();
early_ioremap_init();
+ setup_olpc_ofw_pgd();
+
ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
screen_info = boot_params.screen_info;
edid_info = boot_params.edid_info;