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Add a function, get_page(), whose job is to find which logical page should 

be used to load a given physical page.  At the moment, this just returns
the page's current logical mapping, but in future it might handle returning
bounce pages for physical pages which are in use, and copying to the correct
page just before loading the kernel.
This commit is contained in:
bjh21 2002-05-27 20:17:11 +00:00
parent 4f4c426502
commit c489f6804b
1 changed files with 27 additions and 16 deletions
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43
sys/arch/acorn26/stand/boot26/boot26.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: boot26.c,v 1.1 2002/03/24 15:47:25 bjh21 Exp $ */ /* $NetBSD: boot26.c,v 1.2 2002/05/27 20:17:11 bjh21 Exp $ */
/*- /*-
* Copyright (c) 1998, 1999, 2000, 2001 Ben Harris * Copyright (c) 1998, 1999, 2000, 2001 Ben Harris
@ -208,20 +208,39 @@ get_mem_map(struct os_mem_map_request *pginfo, enum pgstatus *pgstatus,
} }
} }
/*
* Return the address of a page that will end up corresponding to the
* target address when the kernel boots. "target" is expected to be
* in the MEMC physical RAM area (0x02000000--0x02ffffff). It need
* not be page-aligned. The return value is in the logical RAM area,
* and either points to a mapping of the requested page or to a
* mapping of another page which will be copied to the requested page
* after RISC OS is shut down.
*
* At present, there's no relocation mechanism, so we panic if its use
* is required.
*/
static caddr_t
get_page(caddr_t target)
{
int ppn;
ppn = ((caddr_t)target - MEMC_PHYS_BASE) / nbpp;
if (pgstatus[ppn] != FREE)
panic("Page %d not free", ppn);
return pginfo[ppn].map;
}
ssize_t ssize_t
boot26_read(int f, void *addr, size_t size) boot26_read(int f, void *addr, size_t size)
{ {
int ppn;
caddr_t fragaddr; caddr_t fragaddr;
size_t fragsize; size_t fragsize;
ssize_t retval, total; ssize_t retval, total;
total = 0; total = 0;
while (size > 0) { while (size > 0) {
ppn = ((caddr_t)addr - MEMC_PHYS_BASE) / nbpp; fragaddr = get_page(addr) + ((u_int)addr % nbpp);
if (pgstatus[ppn] != FREE)
panic("Page %d not free", ppn);
fragaddr = pginfo[ppn].map + ((u_int)addr % nbpp);
fragsize = nbpp - ((u_int)addr % nbpp); fragsize = nbpp - ((u_int)addr % nbpp);
if (fragsize > size) if (fragsize > size)
fragsize = size; fragsize = size;
@ -240,16 +259,12 @@ boot26_read(int f, void *addr, size_t size)
void * void *
boot26_memcpy(void *dst, const void *src, size_t size) boot26_memcpy(void *dst, const void *src, size_t size)
{ {
int ppn;
caddr_t fragaddr; caddr_t fragaddr;
size_t fragsize; size_t fragsize;
void *addr = dst; void *addr = dst;
while (size > 0) { while (size > 0) {
ppn = ((caddr_t)addr - MEMC_PHYS_BASE) / nbpp; fragaddr = get_page(addr) + ((u_int)addr % nbpp);
if (pgstatus[ppn] != FREE)
panic("Page %d not free", ppn);
fragaddr = pginfo[ppn].map + ((u_int)addr % nbpp);
fragsize = nbpp - ((u_int)addr % nbpp); fragsize = nbpp - ((u_int)addr % nbpp);
if (fragsize > size) if (fragsize > size)
fragsize = size; fragsize = size;
@ -264,16 +279,12 @@ boot26_memcpy(void *dst, const void *src, size_t size)
void * void *
boot26_memset(void *dst, int c, size_t size) boot26_memset(void *dst, int c, size_t size)
{ {
int ppn;
caddr_t fragaddr; caddr_t fragaddr;
size_t fragsize; size_t fragsize;
void *addr = dst; void *addr = dst;
while (size > 0) { while (size > 0) {
ppn = ((caddr_t)addr - MEMC_PHYS_BASE) / nbpp; fragaddr = get_page(addr) + ((u_int)addr % nbpp);
if (pgstatus[ppn] != FREE)
panic("Page %d not free", ppn);
fragaddr = pginfo[ppn].map + ((u_int)addr % nbpp);
fragsize = nbpp - ((u_int)addr % nbpp); fragsize = nbpp - ((u_int)addr % nbpp);
if (fragsize > size) if (fragsize > size)
fragsize = size; fragsize = size;