/*
?*?arch/alpha/boot/bootp.c
?*
?*?Copyright?（C）?1997?Jay?Estabrook
?*
?*?This?file?is?used?for?creating?a?bootp?file?for?the?Linux/AXP?kernel
?*
?*?based?significantly?on?the?arch/alpha/boot/main.c?of?Linus?Torvalds
?*/
#include?
#include?
#include?
#include?

#include?
#include?
#include?
#include?
#include?

#include?

#include?“ksize.h“

extern?unsigned?long?switch_to_osf_pal（unsigned?long?nr
	struct?pcb_struct?*?pcb_va?struct?pcb_struct?*?pcb_pa
	unsigned?long?*vptb）;

extern?void?move_stack（unsigned?long?new_stack）;

struct?hwrpb_struct?*hwrpb?=?INIT_HWRPB;
static?struct?pcb_struct?pcb_va[1];

/*
?*?Find?a?physical?address?of?a?virtual?object..
?*
?*?This?is?easy?using?the?virtual?page?table?address.
?*/

static?inline?void?*
find_pa（unsigned?long?*vptb?void?*ptr）
{
	unsigned?long?address?=?（unsigned?long）?ptr;
	unsigned?long?result;

	result?=?vptb[address?>>?13];
	result?>>=?32;
	result?<<=?13;
	result?|=?address?&?0x1fff;
	return?（void?*）?result;
}	

/*
?*?This?function?moves?into?OSF/1?pal-code?and?has?a?temporary
?*?PCB?for?that.?The?kernel?proper?should?replace?this?PCB?with
?*?the?real?one?as?soon?as?possible.
?*
?*?The?page?table?muckery?in?here?depends?on?the?fact?that?the?boot
?*?code?has?the?L1?page?table?identity-map?itself?in?the?second?PTE
?*?in?the?L1?page?table.?Thus?the?L1-page?is?virtually?addressable
?*?itself?（through?three?levels）?at?virtual?address?0x200802000.
?*/

#define?VPTB	（（unsigned?long?*）?0x200000000）
#define?L1	（（unsigned?long?*）?0x200802000）

void
pal_init（void）
{
	unsigned?long?i?rev;
	struct?percpu_struct?*?percpu;
	struct?pcb_struct?*?pcb_pa;

	/*?Create?the?dummy?PCB.??*/
	pcb_va->ksp?=?0;
	pcb_va->usp?=?0;
	pcb_va->ptbr?=?L1[1]?>>?32;
	pcb_va->asn?=?0;
	pcb_va->pcc?=?0;
	pcb_va->unique?=?0;
	pcb_va->flags?=?1;
	pcb_va->res1?=?0;
	pcb_va->res2?=?0;
	pcb_pa?=?find_pa（VPTB?pcb_va）;

	/*
	?*?a0?=?2?（OSF）
	?*?a1?=?return?address?but?we?give?the?asm?the?vaddr?of?the?PCB
	?*?a2?=?physical?addr?of?PCB
	?*?a3?=?new?virtual?page?table?pointer
	?*?a4?=?KSP?（but?the?asm?sets?it）
	?*/
	srm_printk（“Switching?to?OSF?PAL-code?..?“）;

	i?=?switch_to_osf_pal（2?pcb_va?pcb_pa?VPTB）;
	if?（i）?{
		srm_printk（“failed?code?%ld\n“?i）;
		__halt（）;
	}

	percpu?=?（struct?percpu_struct?*）
		（INIT_HWRPB->processor_offset?+?（unsigned?long）?INIT_HWRPB）;
	rev?=?percpu->pal_revision?=?percpu->palcode_avail[2];

	srm_printk（“Ok?（rev?%lx）\n“?rev）;

	tbia（）;?/*?do?it?directly?in?case?we?are?SMP?*/
}

static?inline?void
load（unsigned?long?dst?unsigned?long?src?unsigned?long?count）
{
	memcpy（（void?*）dst?（void?*）src?count）;
}

/*
?*?Start?the?kernel.
?*/
static?inline?void
runkernel（void）
{
	__asm__?__volatile__（
		“bis?%0%0$27\n\t“
		“jmp?（$27）“
		:?/*?no?outputs:?it?doesn‘t?even?return?*/
		:?“r“?（START_ADDR））;
}

extern?char?_end;
#define?KERNEL_ORIGIN?\
	（（（（unsigned?long）&_end）?+?51