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Since we dont support switching screenmodes (yet) we might as well claim 

just enough for the screenmemory to be in instead of the maximum of 1Mb.
Small machines like my 8Mb NC get a 700 kb back and thats really noticeable.
This commit is contained in:
reinoud 2002-12-30 03:30:16 +00:00
parent 3d3cc353c3
commit 2f6fe363fa
1 changed files with 13 additions and 4 deletions
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15
sys/arch/acorn32/stand/boot32/boot32.c
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@ -1,4 +1,4 @@
/* $NetBSD: boot32.c,v 1.4 2002/12/30 02:19:20 reinoud Exp $ */
/* $NetBSD: boot32.c,v 1.5 2002/12/30 03:30:16 reinoud Exp $ */
/*-
* Copyright (c) 2002 Reinoud Zandijk
@ -267,7 +267,7 @@ void prepare_and_check_relocation_system(void) {
void get_memory_configuration(void) {
int loop, current_page_type, page_count, phys_page;
int page, count;
int page, count, bank;
int mapped_screen_memory;
printf("Getting memory configuration ");
@ -353,12 +353,21 @@ void get_memory_configuration(void) {
if (VRAM_pages[0] == 0) {
/* map bottom DRAM as video memory */
display_size = vdu_var(os_VDUVAR_TOTAL_SCREEN_SIZE) & ~(nbpp-1);
#if 0
mapped_screen_memory = 1024 * 1024; /* max allowed on RiscPC */
videomem_start = DRAM_addr[0];
videomem_pages = (mapped_screen_memory / nbpp);
display_size = vdu_var(os_VDUVAR_TOTAL_SCREEN_SIZE) & ~(nbpp-1);
DRAM_addr[0] += videomem_pages * nbpp;
DRAM_pages[0] -= videomem_pages;
#else
mapped_screen_memory = display_size;
bank = dram_blocks-1; /* pick last SIMM */
videomem_start = DRAM_addr[bank];
videomem_pages = (mapped_screen_memory / nbpp);
DRAM_addr[bank] += videomem_pages * nbpp; /* at the front of the SIMM */
DRAM_pages[bank]-= videomem_pages;
#endif
} else {
/* use VRAM */
mapped_screen_memory = 0;