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rockbox/firmware/target/sh/system-sh.c

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Oops, forgot to commit 2 new files... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13115 a1c6a512-1295-4272-9138-f99709370657
2007-04-11 23:54:34 +00:00
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Jens Arnold
A bit of clarification of code origin. No code change. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13173 a1c6a512-1295-4272-9138-f99709370657
2007-04-15 22:52:42 +00:00
* Based on the work of Alan Korr and others
Oops, forgot to commit 2 new files... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13115 a1c6a512-1295-4272-9138-f99709370657
2007-04-11 23:54:34 +00:00
*
Updated our source code header to explicitly mention that we are GPL v2 or later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
2008-06-28 18:10:04 +00:00
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
Oops, forgot to commit 2 new files... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13115 a1c6a512-1295-4272-9138-f99709370657
2007-04-11 23:54:34 +00:00
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include "config.h"
#include "system.h"
#include "lcd.h"
#include "font.h"
#include "led.h"
static const char* const irqname[] = {
"", "", "", "", "IllInstr", "", "IllSltIn","","",
"CPUAdrEr", "DMAAdrEr", "NMI", "UserBrk",
"","","","","","","","","","","","","","","","","","","",
"Trap32","Trap33","Trap34","Trap35","Trap36","Trap37","Trap38","Trap39",
"Trap40","Trap41","Trap42","Trap43","Trap44","Trap45","Trap46","Trap47",
"Trap48","Trap49","Trap50","Trap51","Trap52","Trap53","Trap54","Trap55",
"Trap56","Trap57","Trap58","Trap59","Trap60","Trap61","Trap62","Trap63",
"Irq0","Irq1","Irq2","Irq3","Irq4","Irq5","Irq6","Irq7",
"Dma0","","Dma1","","Dma2","","Dma3","",
"IMIA0","IMIB0","OVI0","", "IMIA1","IMIB1","OVI1","",
"IMIA2","IMIB2","OVI2","", "IMIA3","IMIB3","OVI3","",
"IMIA4","IMIB4","OVI4","",
"Ser0Err","Ser0Rx","Ser0Tx","Ser0TE",
"Ser1Err","Ser1Rx","Ser1Tx","Ser1TE",
"ParityEr","A/D conv","","","Watchdog","DRAMRefr"
};
#define RESERVE_INTERRUPT(number) "\t.long\t_UIE" #number "\n"
#define DEFAULT_INTERRUPT(name, number) "\t.weak\t_" #name \
"\n\t.set\t_" #name ",_UIE" #number \
"\n\t.long\t_" #name "\n"
asm (
/* Vector table.
* Handled in asm because gcc 4.x doesn't allow weak aliases to symbols
* defined in an asm block -- silly.
* Reset vectors (0..3) are handled in crt0.S */
".section\t.vectors,\"aw\",@progbits\n"
DEFAULT_INTERRUPT (GII, 4)
RESERVE_INTERRUPT ( 5)
DEFAULT_INTERRUPT (ISI, 6)
RESERVE_INTERRUPT ( 7)
RESERVE_INTERRUPT ( 8)
DEFAULT_INTERRUPT (CPUAE, 9)
DEFAULT_INTERRUPT (DMAAE, 10)
DEFAULT_INTERRUPT (NMI, 11)
DEFAULT_INTERRUPT (UB, 12)
RESERVE_INTERRUPT ( 13)
RESERVE_INTERRUPT ( 14)
RESERVE_INTERRUPT ( 15)
RESERVE_INTERRUPT ( 16) /* TCB #0 */
RESERVE_INTERRUPT ( 17) /* TCB #1 */
RESERVE_INTERRUPT ( 18) /* TCB #2 */
RESERVE_INTERRUPT ( 19) /* TCB #3 */
RESERVE_INTERRUPT ( 20) /* TCB #4 */
RESERVE_INTERRUPT ( 21) /* TCB #5 */
RESERVE_INTERRUPT ( 22) /* TCB #6 */
RESERVE_INTERRUPT ( 23) /* TCB #7 */
RESERVE_INTERRUPT ( 24) /* TCB #8 */
RESERVE_INTERRUPT ( 25) /* TCB #9 */
RESERVE_INTERRUPT ( 26) /* TCB #10 */
RESERVE_INTERRUPT ( 27) /* TCB #11 */
RESERVE_INTERRUPT ( 28) /* TCB #12 */
RESERVE_INTERRUPT ( 29) /* TCB #13 */
RESERVE_INTERRUPT ( 30) /* TCB #14 */
RESERVE_INTERRUPT ( 31) /* TCB #15 */
DEFAULT_INTERRUPT (TRAPA32, 32)
DEFAULT_INTERRUPT (TRAPA33, 33)
DEFAULT_INTERRUPT (TRAPA34, 34)
DEFAULT_INTERRUPT (TRAPA35, 35)
DEFAULT_INTERRUPT (TRAPA36, 36)
DEFAULT_INTERRUPT (TRAPA37, 37)
DEFAULT_INTERRUPT (TRAPA38, 38)
DEFAULT_INTERRUPT (TRAPA39, 39)
DEFAULT_INTERRUPT (TRAPA40, 40)
DEFAULT_INTERRUPT (TRAPA41, 41)
DEFAULT_INTERRUPT (TRAPA42, 42)
DEFAULT_INTERRUPT (TRAPA43, 43)
DEFAULT_INTERRUPT (TRAPA44, 44)
DEFAULT_INTERRUPT (TRAPA45, 45)
DEFAULT_INTERRUPT (TRAPA46, 46)
DEFAULT_INTERRUPT (TRAPA47, 47)
DEFAULT_INTERRUPT (TRAPA48, 48)
DEFAULT_INTERRUPT (TRAPA49, 49)
DEFAULT_INTERRUPT (TRAPA50, 50)
DEFAULT_INTERRUPT (TRAPA51, 51)
DEFAULT_INTERRUPT (TRAPA52, 52)
DEFAULT_INTERRUPT (TRAPA53, 53)
DEFAULT_INTERRUPT (TRAPA54, 54)
DEFAULT_INTERRUPT (TRAPA55, 55)
DEFAULT_INTERRUPT (TRAPA56, 56)
DEFAULT_INTERRUPT (TRAPA57, 57)
DEFAULT_INTERRUPT (TRAPA58, 58)
DEFAULT_INTERRUPT (TRAPA59, 59)
DEFAULT_INTERRUPT (TRAPA60, 60)
DEFAULT_INTERRUPT (TRAPA61, 61)
DEFAULT_INTERRUPT (TRAPA62, 62)
DEFAULT_INTERRUPT (TRAPA63, 63)
DEFAULT_INTERRUPT (IRQ0, 64)
DEFAULT_INTERRUPT (IRQ1, 65)
DEFAULT_INTERRUPT (IRQ2, 66)
DEFAULT_INTERRUPT (IRQ3, 67)
DEFAULT_INTERRUPT (IRQ4, 68)
DEFAULT_INTERRUPT (IRQ5, 69)
DEFAULT_INTERRUPT (IRQ6, 70)
DEFAULT_INTERRUPT (IRQ7, 71)
DEFAULT_INTERRUPT (DEI0, 72)
RESERVE_INTERRUPT ( 73)
DEFAULT_INTERRUPT (DEI1, 74)
RESERVE_INTERRUPT ( 75)
DEFAULT_INTERRUPT (DEI2, 76)
RESERVE_INTERRUPT ( 77)
DEFAULT_INTERRUPT (DEI3, 78)
RESERVE_INTERRUPT ( 79)
DEFAULT_INTERRUPT (IMIA0, 80)
DEFAULT_INTERRUPT (IMIB0, 81)
DEFAULT_INTERRUPT (OVI0, 82)
RESERVE_INTERRUPT ( 83)
DEFAULT_INTERRUPT (IMIA1, 84)
DEFAULT_INTERRUPT (IMIB1, 85)
DEFAULT_INTERRUPT (OVI1, 86)
RESERVE_INTERRUPT ( 87)
DEFAULT_INTERRUPT (IMIA2, 88)
DEFAULT_INTERRUPT (IMIB2, 89)
DEFAULT_INTERRUPT (OVI2, 90)
RESERVE_INTERRUPT ( 91)
DEFAULT_INTERRUPT (IMIA3, 92)
DEFAULT_INTERRUPT (IMIB3, 93)
DEFAULT_INTERRUPT (OVI3, 94)
RESERVE_INTERRUPT ( 95)
DEFAULT_INTERRUPT (IMIA4, 96)
DEFAULT_INTERRUPT (IMIB4, 97)
DEFAULT_INTERRUPT (OVI4, 98)
RESERVE_INTERRUPT ( 99)
DEFAULT_INTERRUPT (REI0, 100)
DEFAULT_INTERRUPT (RXI0, 101)
DEFAULT_INTERRUPT (TXI0, 102)
DEFAULT_INTERRUPT (TEI0, 103)
DEFAULT_INTERRUPT (REI1, 104)
DEFAULT_INTERRUPT (RXI1, 105)
DEFAULT_INTERRUPT (TXI1, 106)
DEFAULT_INTERRUPT (TEI1, 107)
RESERVE_INTERRUPT ( 108)
DEFAULT_INTERRUPT (ADITI, 109)
/* UIE# block.
* Must go into the same section as the UIE() handler */
"\t.text\n"
"_UIE4:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE5:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE6:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE7:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE8:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE9:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE10:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE11:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE12:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE13:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE14:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE15:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE16:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE17:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE18:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE19:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE20:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE21:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE22:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE23:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE24:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE25:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE26:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE27:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE28:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE29:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE30:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE31:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE32:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE33:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE34:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE35:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE36:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE37:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE38:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE39:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE40:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE41:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE42:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE43:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE44:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE45:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE46:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE47:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE48:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE49:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE50:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE51:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE52:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE53:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE54:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE55:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE56:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE57:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE58:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE59:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE60:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE61:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE62:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE63:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE64:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE65:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE66:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE67:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE68:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE69:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE70:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE71:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE72:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE73:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE74:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE75:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE76:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE77:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE78:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE79:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE80:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE81:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE82:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE83:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE84:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE85:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE86:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE87:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE88:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE89:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE90:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE91:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE92:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE93:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE94:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE95:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE96:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE97:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE98:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE99:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE100:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE101:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE102:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE103:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE104:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE105:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE106:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE107:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE108:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
"_UIE109:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
);
extern void UIE4(void); /* needed for calculating the UIE number */
void UIE (unsigned int pc) __attribute__((section(".text")));
void UIE (unsigned int pc) /* Unexpected Interrupt or Exception */
{
#if CONFIG_LED == LED_REAL
bool state = false;
int i = 0;
#endif
unsigned int n;
char str[32];
asm volatile ("sts\tpr,%0" : "=r"(n));
/* clear screen */
lcd_clear_display ();
#ifdef HAVE_LCD_BITMAP
lcd_setfont(FONT_SYSFIXED);
#endif
/* output exception */
n = (n - (unsigned)UIE4 + 12)>>2; /* get exception or interrupt number */
snprintf(str,sizeof(str),"I%02x:%s",n,irqname[n]);
lcd_puts(0,0,str);
snprintf(str,sizeof(str),"at %08x",pc);
lcd_puts(0,1,str);
lcd_update ();
while (1)
{
#if CONFIG_LED == LED_REAL
if (--i <= 0)
{
state = !state;
led(state);
i = 240000;
}
#endif
/* try to restart firmware if ON is pressed */
#if CONFIG_KEYPAD == PLAYER_PAD
if (!(PADRL & 0x20))
#elif CONFIG_KEYPAD == RECORDER_PAD
#ifdef HAVE_FMADC
if (!(PCDR & 0x0008))
#else
if (!(PBDRH & 0x01))
#endif
#elif CONFIG_KEYPAD == ONDIO_PAD
if (!(PCDR & 0x0008))
#endif
{
/* enable the watchguard timer, but don't service it */
RSTCSR_W = 0x5a40; /* Reset enabled, power-on reset */
TCSR_W = 0xa560; /* Watchdog timer mode, timer enabled, sysclk/2 */
}
}
}
void system_init(void)
{
/* Disable all interrupts */
IPRA = 0;
IPRB = 0;
IPRC = 0;
IPRD = 0;
IPRE = 0;
/* NMI level low, falling edge on all interrupts */
ICR = 0;
/* Enable burst and RAS down mode on DRAM */
DCR |= 0x5000;
/* Activate Warp mode (simultaneous internal and external mem access) */
BCR |= 0x2000;
/* Bus state controller initializations. These are only necessary when
running from flash. */
WCR1 = 0x40FD; /* Long wait states for CS6 (ATA), short for the rest. */
WCR3 = 0x8000; /* WAIT is pulled up, 1 state inserted for CS6 */
}
void system_reboot (void)
{
Do core interrupt masking in a less general fashion and save some instructions to decrease size and speed things up a little bit. Small fix to a few places where interrupts would get enabled again where they shouldn't have been (context switching calls when disabled). git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16811 a1c6a512-1295-4272-9138-f99709370657
2008-03-26 01:50:41 +00:00
disable_irq();
Oops, forgot to commit 2 new files... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13115 a1c6a512-1295-4272-9138-f99709370657
2007-04-11 23:54:34 +00:00
asm volatile ("ldc\t%0,vbr" : : "r"(0));
PACR2 |= 0x4000; /* for coldstart detection */
IPRA = 0;
IPRB = 0;
IPRC = 0;
IPRD = 0;
IPRE = 0;
ICR = 0;
asm volatile ("jmp @%0; mov.l @%1,r15" : :
"r"(*(int*)0),"r"(4));
}
/* Utilise the user break controller to catch invalid memory accesses. */
int system_memory_guard(int newmode)
{
static const struct {
unsigned long addr;
unsigned long mask;
unsigned short bbr;
} modes[MAXMEMGUARD] = {
/* catch nothing */
{ 0x00000000, 0x00000000, 0x0000 },
/* catch writes to area 02 (flash ROM) */
{ 0x02000000, 0x00FFFFFF, 0x00F8 },
/* catch all accesses to areas 00 (internal ROM) and 01 (free) */
{ 0x00000000, 0x01FFFFFF, 0x00FC }
};
int oldmode = MEMGUARD_NONE;
int i;
/* figure out the old mode from what is in the UBC regs. If the register
values don't match any mode, assume MEMGUARD_NONE */
for (i = MEMGUARD_NONE; i < MAXMEMGUARD; i++)
{
if (BAR == modes[i].addr && BAMR == modes[i].mask &&
BBR == modes[i].bbr)
{
oldmode = i;
break;
}
}
if (newmode == MEMGUARD_KEEP)
newmode = oldmode;
BBR = 0; /* switch off everything first */
/* always set the UBC according to the mode, in case the old settings
didn't match any valid mode */
BAR = modes[newmode].addr;
BAMR = modes[newmode].mask;
BBR = modes[newmode].bbr;
return oldmode;
}
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