korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-17 17:24:17 +08:00
Code Issues Packages Projects Releases Wiki Activity
ed36959621
linux/arch/ppc/syslib/prom_init.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1003 lines
26 KiB
C
Raw Blame History

/*
* Note that prom_init() and anything called from prom_init()
* may be running at an address that is different from the address
* that it was linked at. References to static data items are
* handled by compiling this file with -mrelocatable-lib.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/btext.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/cacheflush.h>
#ifdef CONFIG_LOGO_LINUX_CLUT224
#include <linux/linux_logo.h>
extern const struct linux_logo logo_linux_clut224;
#endif
/*
* Properties whose value is longer than this get excluded from our
* copy of the device tree. This way we don't waste space storing
* things like "driver,AAPL,MacOS,PowerPC" properties. But this value
* does need to be big enough to ensure that we don't lose things
* like the interrupt-map property on a PCI-PCI bridge.
*/
#define MAX_PROPERTY_LENGTH 4096
#ifndef FB_MAX /* avoid pulling in all of the fb stuff */
#define FB_MAX 8
#endif
#define ALIGNUL(x) (((x) + sizeof(unsigned long)-1) & -sizeof(unsigned long))
typedef u32 prom_arg_t;
struct prom_args {
const char *service;
int nargs;
int nret;
prom_arg_t args[10];
};
struct pci_address {
unsigned a_hi;
unsigned a_mid;
unsigned a_lo;
};
struct pci_reg_property {
struct pci_address addr;
unsigned size_hi;
unsigned size_lo;
};
struct pci_range {
struct pci_address addr;
unsigned phys;
unsigned size_hi;
unsigned size_lo;
};
struct isa_reg_property {
unsigned space;
unsigned address;
unsigned size;
};
struct pci_intr_map {
struct pci_address addr;
unsigned dunno;
phandle int_ctrler;
unsigned intr;
};
static void prom_exit(void);
static int call_prom(const char *service, int nargs, int nret, ...);
static int call_prom_ret(const char *service, int nargs, int nret,
prom_arg_t *rets, ...);
static void prom_print_hex(unsigned int v);
static int prom_set_color(ihandle ih, int i, int r, int g, int b);
static int prom_next_node(phandle *nodep);
static unsigned long check_display(unsigned long mem);
static void setup_disp_fake_bi(ihandle dp);
static unsigned long copy_device_tree(unsigned long mem_start,
unsigned long mem_end);
static unsigned long inspect_node(phandle node, struct device_node *dad,
unsigned long mem_start, unsigned long mem_end,
struct device_node ***allnextpp);
static void prom_hold_cpus(unsigned long mem);
static void prom_instantiate_rtas(void);
static void * early_get_property(unsigned long base, unsigned long node,
char *prop);
prom_entry prom __initdata;
ihandle prom_chosen __initdata;
ihandle prom_stdout __initdata;
static char *prom_display_paths[FB_MAX] __initdata;
static phandle prom_display_nodes[FB_MAX] __initdata;
static unsigned int prom_num_displays __initdata;
static ihandle prom_disp_node __initdata;
char *of_stdout_device __initdata;
unsigned int rtas_data; /* physical pointer */
unsigned int rtas_entry; /* physical pointer */
unsigned int rtas_size;
unsigned int old_rtas;
boot_infos_t *boot_infos;
char *bootpath;
char *bootdevice;
struct device_node *allnodes;
extern char *klimit;
static void __init
prom_exit(void)
{
struct prom_args args;
args.service = "exit";
args.nargs = 0;
args.nret = 0;
prom(&args);
for (;;) /* should never get here */
;
}
static int __init
call_prom(const char *service, int nargs, int nret, ...)
{
va_list list;
int i;
struct prom_args prom_args;
prom_args.service = service;
prom_args.nargs = nargs;
prom_args.nret = nret;
va_start(list, nret);
for (i = 0; i < nargs; ++i)
prom_args.args[i] = va_arg(list, prom_arg_t);
va_end(list);
for (i = 0; i < nret; ++i)
prom_args.args[i + nargs] = 0;
prom(&prom_args);
return prom_args.args[nargs];
}
static int __init
call_prom_ret(const char *service, int nargs, int nret, prom_arg_t *rets, ...)
{
va_list list;
int i;
struct prom_args prom_args;
prom_args.service = service;
prom_args.nargs = nargs;
prom_args.nret = nret;
va_start(list, rets);
for (i = 0; i < nargs; ++i)
prom_args.args[i] = va_arg(list, int);
va_end(list);
for (i = 0; i < nret; ++i)
prom_args.args[i + nargs] = 0;
prom(&prom_args);
for (i = 1; i < nret; ++i)
rets[i-1] = prom_args.args[nargs + i];
return prom_args.args[nargs];
}
void __init
prom_print(const char *msg)
{
const char *p, *q;
if (prom_stdout == 0)
return;
for (p = msg; *p != 0; p = q) {
for (q = p; *q != 0 && *q != '\n'; ++q)
;
if (q > p)
call_prom("write", 3, 1, prom_stdout, p, q - p);
if (*q != 0) {
++q;
call_prom("write", 3, 1, prom_stdout, "\r\n", 2);
}
}
}
static void __init
prom_print_hex(unsigned int v)
{
char buf[16];
int i, c;
for (i = 0; i < 8; ++i) {
c = (v >> ((7-i)*4)) & 0xf;
c += (c >= 10)? ('a' - 10): '0';
buf[i] = c;
}
buf[i] = ' ';
buf[i+1] = 0;
prom_print(buf);
}
static int __init
prom_set_color(ihandle ih, int i, int r, int g, int b)
{
return call_prom("call-method", 6, 1, "color!", ih, i, b, g, r);
}
static int __init
prom_next_node(phandle *nodep)
{
phandle node;
if ((node = *nodep) != 0
&& (*nodep = call_prom("child", 1, 1, node)) != 0)
return 1;
if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
return 1;
for (;;) {
if ((node = call_prom("parent", 1, 1, node)) == 0)
return 0;
if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
return 1;
}
}
#ifdef CONFIG_POWER4
/*
* Set up a hash table with a set of entries in it to map the
* first 64MB of RAM. This is used on 64-bit machines since
* some of them don't have BATs.
*/
static inline void make_pte(unsigned long htab, unsigned int hsize,
unsigned int va, unsigned int pa, int mode)
{
unsigned int *pteg;
unsigned int hash, i, vsid;
vsid = ((va >> 28) * 0x111) << 12;
hash = ((va ^ vsid) >> 5) & 0x7fff80;
pteg = (unsigned int *)(htab + (hash & (hsize - 1)));
for (i = 0; i < 8; ++i, pteg += 4) {
if ((pteg[1] & 1) == 0) {
pteg[1] = vsid | ((va >> 16) & 0xf80) | 1;
pteg[3] = pa | mode;
break;
}
}
}
extern unsigned long _SDR1;
extern PTE *Hash;
extern unsigned long Hash_size;
static void __init
prom_alloc_htab(void)
{
unsigned int hsize;
unsigned long htab;
unsigned int addr;
/*
* Because of OF bugs we can't use the "claim" client
* interface to allocate memory for the hash table.
* This code is only used on 64-bit PPCs, and the only
* 64-bit PPCs at the moment are RS/6000s, and their
* OF is based at 0xc00000 (the 12M point), so we just
* arbitrarily use the 0x800000 - 0xc00000 region for the
* hash table.
* -- paulus.
*/
hsize = 4 << 20; /* POWER4 has no BATs */
htab = (8 << 20);
call_prom("claim", 3, 1, htab, hsize, 0);
Hash = (void *)(htab + KERNELBASE);
Hash_size = hsize;
_SDR1 = htab + __ilog2(hsize) - 18;
/*
* Put in PTEs for the first 64MB of RAM
*/
memset((void *)htab, 0, hsize);
for (addr = 0; addr < 0x4000000; addr += 0x1000)
make_pte(htab, hsize, addr + KERNELBASE, addr,
_PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX);
#if 0 /* DEBUG stuff mapping the SCC */
make_pte(htab, hsize, 0x80013000, 0x80013000,
_PAGE_ACCESSED | _PAGE_NO_CACHE | _PAGE_GUARDED | PP_RWXX);
#endif
}
#endif /* CONFIG_POWER4 */
/*
* If we have a display that we don't know how to drive,
* we will want to try to execute OF's open method for it
* later. However, OF will probably fall over if we do that
* we've taken over the MMU.
* So we check whether we will need to open the display,
* and if so, open it now.
*/
static unsigned long __init
check_display(unsigned long mem)
{
phandle node;
ihandle ih;
int i, j;
char type[16], *path;
static unsigned char default_colors[] = {
0x00, 0x00, 0x00,
0x00, 0x00, 0xaa,
0x00, 0xaa, 0x00,
0x00, 0xaa, 0xaa,
0xaa, 0x00, 0x00,
0xaa, 0x00, 0xaa,
0xaa, 0xaa, 0x00,
0xaa, 0xaa, 0xaa,
0x55, 0x55, 0x55,
0x55, 0x55, 0xff,
0x55, 0xff, 0x55,
0x55, 0xff, 0xff,
0xff, 0x55, 0x55,
0xff, 0x55, 0xff,
0xff, 0xff, 0x55,
0xff, 0xff, 0xff
};
const unsigned char *clut;
prom_disp_node = 0;
for (node = 0; prom_next_node(&node); ) {
type[0] = 0;
call_prom("getprop", 4, 1, node, "device_type",
type, sizeof(type));
if (strcmp(type, "display") != 0)
continue;
/* It seems OF doesn't null-terminate the path :-( */
path = (char *) mem;
memset(path, 0, 256);
if (call_prom("package-to-path", 3, 1, node, path, 255) < 0)
continue;
/*
* If this display is the device that OF is using for stdout,
* move it to the front of the list.
*/
mem += strlen(path) + 1;
i = prom_num_displays++;
if (of_stdout_device != 0 && i > 0
&& strcmp(of_stdout_device, path) == 0) {
for (; i > 0; --i) {
prom_display_paths[i]
= prom_display_paths[i-1];
prom_display_nodes[i]
= prom_display_nodes[i-1];
}
}
prom_display_paths[i] = path;
prom_display_nodes[i] = node;
if (i == 0)
prom_disp_node = node;
if (prom_num_displays >= FB_MAX)
break;
}
for (j=0; j<prom_num_displays; j++) {
path = prom_display_paths[j];
node = prom_display_nodes[j];
prom_print("opening display ");
prom_print(path);
ih = call_prom("open", 1, 1, path);
if (ih == 0 || ih == (ihandle) -1) {
prom_print("... failed\n");
for (i=j+1; i<prom_num_displays; i++) {
prom_display_paths[i-1] = prom_display_paths[i];
prom_display_nodes[i-1] = prom_display_nodes[i];
}
if (--prom_num_displays > 0) {
prom_disp_node = prom_display_nodes[j];
j--;
} else
prom_disp_node = 0;
continue;
} else {
prom_print("... ok\n");
call_prom("setprop", 4, 1, node, "linux,opened", 0, 0);
/*
* Setup a usable color table when the appropriate
* method is available.
* Should update this to use set-colors.
*/
clut = default_colors;
for (i = 0; i < 32; i++, clut += 3)
if (prom_set_color(ih, i, clut[0], clut[1],
clut[2]) != 0)
break;
#ifdef CONFIG_LOGO_LINUX_CLUT224
clut = PTRRELOC(logo_linux_clut224.clut);
for (i = 0; i < logo_linux_clut224.clutsize;
i++, clut += 3)
if (prom_set_color(ih, i + 32, clut[0],
clut[1], clut[2]) != 0)
break;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
}
}
if (prom_stdout) {
phandle p;
p = call_prom("instance-to-package", 1, 1, prom_stdout);
if (p && p != -1) {
type[0] = 0;
call_prom("getprop", 4, 1, p, "device_type",
type, sizeof(type));
if (strcmp(type, "display") == 0)
call_prom("setprop", 4, 1, p, "linux,boot-display",
0, 0);
}
}
return ALIGNUL(mem);
}
/* This function will enable the early boot text when doing OF booting. This
* way, xmon output should work too
*/
static void __init
setup_disp_fake_bi(ihandle dp)
{
#ifdef CONFIG_BOOTX_TEXT
int width = 640, height = 480, depth = 8, pitch;
unsigned address;
struct pci_reg_property addrs[8];
int i, naddrs;
char name[32];
char *getprop = "getprop";
prom_print("Initializing fake screen: ");
memset(name, 0, sizeof(name));
call_prom(getprop, 4, 1, dp, "name", name, sizeof(name));
name[sizeof(name)-1] = 0;
prom_print(name);
prom_print("\n");
call_prom(getprop, 4, 1, dp, "width", &width, sizeof(width));
call_prom(getprop, 4, 1, dp, "height", &height, sizeof(height));
call_prom(getprop, 4, 1, dp, "depth", &depth, sizeof(depth));
pitch = width * ((depth + 7) / 8);
call_prom(getprop, 4, 1, dp, "linebytes",
&pitch, sizeof(pitch));
if (pitch == 1)
pitch = 0x1000; /* for strange IBM display */
address = 0;
call_prom(getprop, 4, 1, dp, "address",
&address, sizeof(address));
if (address == 0) {
/* look for an assigned address with a size of >= 1MB */
naddrs = call_prom(getprop, 4, 1, dp, "assigned-addresses",
addrs, sizeof(addrs));
naddrs /= sizeof(struct pci_reg_property);
for (i = 0; i < naddrs; ++i) {
if (addrs[i].size_lo >= (1 << 20)) {
address = addrs[i].addr.a_lo;
/* use the BE aperture if possible */
if (addrs[i].size_lo >= (16 << 20))
address += (8 << 20);
break;
}
}
if (address == 0) {
prom_print("Failed to get address\n");
return;
}
}
/* kludge for valkyrie */
if (strcmp(name, "valkyrie") == 0)
address += 0x1000;
#ifdef CONFIG_POWER4
#if CONFIG_TASK_SIZE > 0x80000000
#error CONFIG_TASK_SIZE cannot be above 0x80000000 with BOOTX_TEXT on G5
#endif
{
extern boot_infos_t disp_bi;
unsigned long va, pa, i, offset;
va = 0x90000000;
pa = address & 0xfffff000ul;
offset = address & 0x00000fff;
for (i=0; i<0x4000; i++) {
make_pte((unsigned long)Hash - KERNELBASE, Hash_size, va, pa,
_PAGE_ACCESSED | _PAGE_NO_CACHE |
_PAGE_GUARDED | PP_RWXX);
va += 0x1000;
pa += 0x1000;
}
btext_setup_display(width, height, depth, pitch, 0x90000000 | offset);
disp_bi.dispDeviceBase = (u8 *)address;
}
#else /* CONFIG_POWER4 */
btext_setup_display(width, height, depth, pitch, address);
btext_prepare_BAT();
#endif /* CONFIG_POWER4 */
#endif /* CONFIG_BOOTX_TEXT */
}
/*
* Make a copy of the device tree from the PROM.
*/
static unsigned long __init
copy_device_tree(unsigned long mem_start, unsigned long mem_end)
{
phandle root;
unsigned long new_start;
struct device_node **allnextp;
root = call_prom("peer", 1, 1, (phandle)0);
if (root == (phandle)0) {
prom_print("couldn't get device tree root\n");
prom_exit();
}
allnextp = &allnodes;
mem_start = ALIGNUL(mem_start);
new_start = inspect_node(root, NULL, mem_start, mem_end, &allnextp);
*allnextp = NULL;
return new_start;
}
static unsigned long __init
inspect_node(phandle node, struct device_node *dad,
unsigned long mem_start, unsigned long mem_end,
struct device_node ***allnextpp)
{
int l;
phandle child;
struct device_node *np;
struct property *pp, **prev_propp;
char *prev_name, *namep;
unsigned char *valp;
np = (struct device_node *) mem_start;
mem_start += sizeof(struct device_node);
memset(np, 0, sizeof(*np));
np->node = node;
**allnextpp = PTRUNRELOC(np);
*allnextpp = &np->allnext;
if (dad != 0) {
np->parent = PTRUNRELOC(dad);
/* we temporarily use the `next' field as `last_child'. */
if (dad->next == 0)
dad->child = PTRUNRELOC(np);
else
dad->next->sibling = PTRUNRELOC(np);
dad->next = np;
}
/* get and store all properties */
prev_propp = &np->properties;
prev_name = "";
for (;;) {
pp = (struct property *) mem_start;
namep = (char *) (pp + 1);
pp->name = PTRUNRELOC(namep);
if (call_prom("nextprop", 3, 1, node, prev_name, namep) <= 0)
break;
mem_start = ALIGNUL((unsigned long)namep + strlen(namep) + 1);
prev_name = namep;
valp = (unsigned char *) mem_start;
pp->value = PTRUNRELOC(valp);
pp->length = call_prom("getprop", 4, 1, node, namep,
valp, mem_end - mem_start);
if (pp->length < 0)
continue;
#ifdef MAX_PROPERTY_LENGTH
if (pp->length > MAX_PROPERTY_LENGTH)
continue; /* ignore this property */
#endif
mem_start = ALIGNUL(mem_start + pp->length);
*prev_propp = PTRUNRELOC(pp);
prev_propp = &pp->next;
}
if (np->node != 0) {
/* Add a "linux,phandle" property" */
pp = (struct property *) mem_start;
*prev_propp = PTRUNRELOC(pp);
prev_propp = &pp->next;
namep = (char *) (pp + 1);
pp->name = PTRUNRELOC(namep);
strcpy(namep, "linux,phandle");
mem_start = ALIGNUL((unsigned long)namep + strlen(namep) + 1);
pp->value = (unsigned char *) PTRUNRELOC(&np->node);
pp->length = sizeof(np->node);
}
*prev_propp = NULL;
/* get the node's full name */
l = call_prom("package-to-path", 3, 1, node,
mem_start, mem_end - mem_start);
if (l >= 0) {
np->full_name = PTRUNRELOC((char *) mem_start);
*(char *)(mem_start + l) = 0;
mem_start = ALIGNUL(mem_start + l + 1);
}
/* do all our children */
child = call_prom("child", 1, 1, node);
while (child != 0) {
mem_start = inspect_node(child, np, mem_start, mem_end,
allnextpp);
child = call_prom("peer", 1, 1, child);
}
return mem_start;
}
unsigned long smp_chrp_cpu_nr __initdata = 0;
/*
* With CHRP SMP we need to use the OF to start the other
* processors so we can't wait until smp_boot_cpus (the OF is
* trashed by then) so we have to put the processors into
* a holding pattern controlled by the kernel (not OF) before
* we destroy the OF.
*
* This uses a chunk of high memory, puts some holding pattern
* code there and sends the other processors off to there until
* smp_boot_cpus tells them to do something. We do that by using
* physical address 0x0. The holding pattern checks that address
* until its cpu # is there, when it is that cpu jumps to
* __secondary_start(). smp_boot_cpus() takes care of setting those
* values.
*
* We also use physical address 0x4 here to tell when a cpu
* is in its holding pattern code.
*
* -- Cort
*
* Note that we have to do this if we have more than one CPU,
* even if this is a UP kernel. Otherwise when we trash OF
* the other CPUs will start executing some random instructions
* and crash the system. -- paulus
*/
static void __init
prom_hold_cpus(unsigned long mem)
{
extern void __secondary_hold(void);
unsigned long i;
int cpu;
phandle node;
char type[16], *path;
unsigned int reg;
/*
* XXX: hack to make sure we're chrp, assume that if we're
* chrp we have a device_type property -- Cort
*/
node = call_prom("finddevice", 1, 1, "/");
if (call_prom("getprop", 4, 1, node,
"device_type", type, sizeof(type)) <= 0)
return;
/* copy the holding pattern code to someplace safe (0) */
/* the holding pattern is now within the first 0x100
bytes of the kernel image -- paulus */
memcpy((void *)0, _stext, 0x100);
flush_icache_range(0, 0x100);
/* look for cpus */
*(unsigned long *)(0x0) = 0;
asm volatile("dcbf 0,%0": : "r" (0) : "memory");
for (node = 0; prom_next_node(&node); ) {
type[0] = 0;
call_prom("getprop", 4, 1, node, "device_type",
type, sizeof(type));
if (strcmp(type, "cpu") != 0)
continue;
path = (char *) mem;
memset(path, 0, 256);
if (call_prom("package-to-path", 3, 1, node, path, 255) < 0)
continue;
reg = -1;
call_prom("getprop", 4, 1, node, "reg", &reg, sizeof(reg));
cpu = smp_chrp_cpu_nr++;
#ifdef CONFIG_SMP
smp_hw_index[cpu] = reg;
#endif /* CONFIG_SMP */
/* XXX: hack - don't start cpu 0, this cpu -- Cort */
if (cpu == 0)
continue;
prom_print("starting cpu ");
prom_print(path);
*(ulong *)(0x4) = 0;
call_prom("start-cpu", 3, 0, node,
(char *)__secondary_hold - _stext, cpu);
prom_print("...");
for ( i = 0 ; (i < 10000) && (*(ulong *)(0x4) == 0); i++ )
;
if (*(ulong *)(0x4) == cpu)
prom_print("ok\n");
else {
prom_print("failed: ");
prom_print_hex(*(ulong *)0x4);
prom_print("\n");
}
}
}
static void __init
prom_instantiate_rtas(void)
{
ihandle prom_rtas;
prom_arg_t result;
prom_rtas = call_prom("finddevice", 1, 1, "/rtas");
if (prom_rtas == -1)
return;
rtas_size = 0;
call_prom("getprop", 4, 1, prom_rtas,
"rtas-size", &rtas_size, sizeof(rtas_size));
prom_print("instantiating rtas");
if (rtas_size == 0) {
rtas_data = 0;
} else {
/*
* Ask OF for some space for RTAS.
* Actually OF has bugs so we just arbitrarily
* use memory at the 6MB point.
*/
rtas_data = 6 << 20;
prom_print(" at ");
prom_print_hex(rtas_data);
}
prom_rtas = call_prom("open", 1, 1, "/rtas");
prom_print("...");
rtas_entry = 0;
if (call_prom_ret("call-method", 3, 2, &result,
"instantiate-rtas", prom_rtas, rtas_data) == 0)
rtas_entry = result;
if ((rtas_entry == -1) || (rtas_entry == 0))
prom_print(" failed\n");
else
prom_print(" done\n");
}
/*
* We enter here early on, when the Open Firmware prom is still
* handling exceptions and the MMU hash table for us.
*/
unsigned long __init
prom_init(int r3, int r4, prom_entry pp)
{
unsigned long mem;
ihandle prom_mmu;
unsigned long offset = reloc_offset();
int i, l;
char *p, *d;
unsigned long phys;
prom_arg_t result[3];
char model[32];
phandle node;
int rc;
/* Default */
phys = (unsigned long) &_stext;
/* First get a handle for the stdout device */
prom = pp;
prom_chosen = call_prom("finddevice", 1, 1, "/chosen");
if (prom_chosen == -1)
prom_exit();
if (call_prom("getprop", 4, 1, prom_chosen, "stdout",
&prom_stdout, sizeof(prom_stdout)) <= 0)
prom_exit();
/* Get the full OF pathname of the stdout device */
mem = (unsigned long) klimit + offset;
p = (char *) mem;
memset(p, 0, 256);
call_prom("instance-to-path", 3, 1, prom_stdout, p, 255);
of_stdout_device = p;
mem += strlen(p) + 1;
/* Get the boot device and translate it to a full OF pathname. */
p = (char *) mem;
l = call_prom("getprop", 4, 1, prom_chosen, "bootpath", p, 1<<20);
if (l > 0) {
p[l] = 0; /* should already be null-terminated */
bootpath = PTRUNRELOC(p);
mem += l + 1;
d = (char *) mem;
*d = 0;
call_prom("canon", 3, 1, p, d, 1<<20);
bootdevice = PTRUNRELOC(d);
mem = ALIGNUL(mem + strlen(d) + 1);
}
prom_instantiate_rtas();
#ifdef CONFIG_POWER4
/*
* Find out how much memory we have and allocate a
* suitably-sized hash table.
*/
prom_alloc_htab();
#endif
mem = check_display(mem);
prom_print("copying OF device tree...");
mem = copy_device_tree(mem, mem + (1<<20));
prom_print("done\n");
prom_hold_cpus(mem);
klimit = (char *) (mem - offset);
node = call_prom("finddevice", 1, 1, "/");
rc = call_prom("getprop", 4, 1, node, "model", model, sizeof(model));
if (rc > 0 && !strncmp (model, "Pegasos", 7)
&& strncmp (model, "Pegasos2", 8)) {
/* Pegasos 1 has a broken translate method in the OF,
* and furthermore the BATs are mapped 1:1 so the phys
* address calculated above is correct, so let's use
* it directly.
*/
} else if (offset == 0) {
/* If we are already running at 0xc0000000, we assume we were
* loaded by an OF bootloader which did set a BAT for us.
* This breaks OF translate so we force phys to be 0.
*/
prom_print("(already at 0xc0000000) phys=0\n");
phys = 0;
} else if (call_prom("getprop", 4, 1, prom_chosen, "mmu",
&prom_mmu, sizeof(prom_mmu)) <= 0) {
prom_print(" no MMU found\n");
} else if (call_prom_ret("call-method", 4, 4, result, "translate",
prom_mmu, &_stext, 1) != 0) {
prom_print(" (translate failed)\n");
} else {
/* We assume the phys. address size is 3 cells */
phys = result[2];
}
if (prom_disp_node != 0)
setup_disp_fake_bi(prom_disp_node);
/* Use quiesce call to get OF to shut down any devices it's using */
prom_print("Calling quiesce ...\n");
call_prom("quiesce", 0, 0);
/* Relocate various pointers which will be used once the
kernel is running at the address it was linked at. */
for (i = 0; i < prom_num_displays; ++i)
prom_display_paths[i] = PTRUNRELOC(prom_display_paths[i]);
#ifdef CONFIG_SERIAL_CORE_CONSOLE
/* Relocate the of stdout for console autodetection */
of_stdout_device = PTRUNRELOC(of_stdout_device);
#endif
prom_print("returning 0x");
prom_print_hex(phys);
prom_print("from prom_init\n");
prom_stdout = 0;
return phys;
}
/*
* early_get_property is used to access the device tree image prepared
* by BootX very early on, before the pointers in it have been relocated.
*/
static void * __init
early_get_property(unsigned long base, unsigned long node, char *prop)
{
struct device_node *np = (struct device_node *)(base + node);
struct property *pp;
for (pp = np->properties; pp != 0; pp = pp->next) {
pp = (struct property *) (base + (unsigned long)pp);
if (strcmp((char *)((unsigned long)pp->name + base),
prop) == 0) {
return (void *)((unsigned long)pp->value + base);
}
}
return NULL;
}
/* Is boot-info compatible ? */
#define BOOT_INFO_IS_COMPATIBLE(bi) ((bi)->compatible_version <= BOOT_INFO_VERSION)
#define BOOT_INFO_IS_V2_COMPATIBLE(bi) ((bi)->version >= 2)
#define BOOT_INFO_IS_V4_COMPATIBLE(bi) ((bi)->version >= 4)
void __init
bootx_init(unsigned long r4, unsigned long phys)
{
boot_infos_t *bi = (boot_infos_t *) r4;
unsigned long space;
unsigned long ptr, x;
char *model;
boot_infos = PTRUNRELOC(bi);
if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
bi->logicalDisplayBase = NULL;
#ifdef CONFIG_BOOTX_TEXT
btext_init(bi);
/*
* Test if boot-info is compatible. Done only in config
* CONFIG_BOOTX_TEXT since there is nothing much we can do
* with an incompatible version, except display a message
* and eventually hang the processor...
*
* I'll try to keep enough of boot-info compatible in the
* future to always allow display of this message;
*/
if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
btext_drawstring(" !!! WARNING - Incompatible version of BootX !!!\n\n\n");
btext_flushscreen();
}
#endif /* CONFIG_BOOTX_TEXT */
/* New BootX enters kernel with MMU off, i/os are not allowed
here. This hack will have been done by the boostrap anyway.
*/
if (bi->version < 4) {
/*
* XXX If this is an iMac, turn off the USB controller.
*/
model = (char *) early_get_property
(r4 + bi->deviceTreeOffset, 4, "model");
if (model
&& (strcmp(model, "iMac,1") == 0
|| strcmp(model, "PowerMac1,1") == 0)) {
out_le32((unsigned *)0x80880008, 1); /* XXX */
}
}
/* Move klimit to enclose device tree, args, ramdisk, etc... */
if (bi->version < 5) {
space = bi->deviceTreeOffset + bi->deviceTreeSize;
if (bi->ramDisk)
space = bi->ramDisk + bi->ramDiskSize;
} else
space = bi->totalParamsSize;
klimit = PTRUNRELOC((char *) bi + space);
/* New BootX will have flushed all TLBs and enters kernel with
MMU switched OFF, so this should not be useful anymore.
*/
if (bi->version < 4) {
/*
* Touch each page to make sure the PTEs for them
* are in the hash table - the aim is to try to avoid
* getting DSI exceptions while copying the kernel image.
*/
for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
x = *(volatile unsigned long *)ptr;
}
#ifdef CONFIG_BOOTX_TEXT
/*
* Note that after we call btext_prepare_BAT, we can't do
* prom_draw*, flushscreen or clearscreen until we turn the MMU
* on, since btext_prepare_BAT sets disp_bi.logicalDisplayBase
* to a virtual address.
*/
btext_prepare_BAT();
#endif
}
Reference in New Issue View Git Blame Copy Permalink