122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
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/*
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* include/asm-v850/rte_multi.c -- Support for Multi debugger monitor ROM
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* on Midas lab RTE-CB series of evaluation boards
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#include <linux/init.h>
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#include <asm/machdep.h>
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#define IRQ_ADDR(irq) (0x80 + (irq) * 0x10)
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/* A table of which interrupt vectors to install, since blindly
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installing all of them makes the debugger stop working. This is a
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list of offsets in the interrupt vector area; each entry means to
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copy that particular 16-byte vector. An entry less than zero ends
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the table. */
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static long multi_intv_install_table[] = {
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/* Trap vectors */
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0x40, 0x50,
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#ifdef CONFIG_RTE_CB_MULTI_DBTRAP
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/* Illegal insn / dbtrap. These are used by multi, so only handle
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them if configured to do so. */
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0x60,
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#endif
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/* GINT1 - GINT3 (note, not GINT0!) */
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IRQ_ADDR (IRQ_GINT(1)),
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IRQ_ADDR (IRQ_GINT(2)),
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IRQ_ADDR (IRQ_GINT(3)),
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/* Timer D interrupts (up to 4 timers) */
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IRQ_ADDR (IRQ_INTCMD(0)),
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#if IRQ_INTCMD_NUM > 1
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IRQ_ADDR (IRQ_INTCMD(1)),
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#if IRQ_INTCMD_NUM > 2
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IRQ_ADDR (IRQ_INTCMD(2)),
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#if IRQ_INTCMD_NUM > 3
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IRQ_ADDR (IRQ_INTCMD(3)),
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#endif
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#endif
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#endif
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/* UART interrupts (up to 3 channels) */
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IRQ_ADDR (IRQ_INTSER (0)), /* err */
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IRQ_ADDR (IRQ_INTSR (0)), /* rx */
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IRQ_ADDR (IRQ_INTST (0)), /* tx */
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#if IRQ_INTSR_NUM > 1
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IRQ_ADDR (IRQ_INTSER (1)), /* err */
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IRQ_ADDR (IRQ_INTSR (1)), /* rx */
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IRQ_ADDR (IRQ_INTST (1)), /* tx */
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#if IRQ_INTSR_NUM > 2
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IRQ_ADDR (IRQ_INTSER (2)), /* err */
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IRQ_ADDR (IRQ_INTSR (2)), /* rx */
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IRQ_ADDR (IRQ_INTST (2)), /* tx */
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#endif
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#endif
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-1
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};
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/* Early initialization for kernel using Multi debugger ROM monitor. */
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void __init multi_init (void)
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{
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/* We're using the Multi debugger monitor, so we have to install
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the interrupt vectors. The monitor doesn't allow them to be
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initially downloaded into their final destination because
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it's in the monitor's scratch-RAM area. Unfortunately, Multi
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also doesn't deal correctly with ELF sections where the LMA
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and VMA differ -- it just ignores the LMA -- so we can't use
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that feature to work around the problem. What we do instead
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is just put the interrupt vectors into a normal section, and
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do the necessary copying and relocation here. Since the
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interrupt vector basically only contains `jr' instructions
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and no-ops, it's not that hard. */
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extern unsigned long _intv_load_start, _intv_start;
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register unsigned long *src = &_intv_load_start;
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register unsigned long *dst = (unsigned long *)INTV_BASE;
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register unsigned long jr_fixup = (char *)&_intv_start - (char *)dst;
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register long *ii;
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/* Copy interrupt vectors as instructed by multi_intv_install_table. */
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for (ii = multi_intv_install_table; *ii >= 0; ii++) {
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/* Copy 16-byte interrupt vector at offset *ii. */
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int boffs;
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for (boffs = 0; boffs < 0x10; boffs += sizeof *src) {
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/* Copy a single word, fixing up the jump offs
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if it's a `jr' instruction. */
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int woffs = (*ii + boffs) / sizeof *src;
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unsigned long word = src[woffs];
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if ((word & 0xFC0) == 0x780) {
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/* A `jr' insn, fix up its offset (and yes, the
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weird half-word swapping is intentional). */
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unsigned short hi = word & 0xFFFF;
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unsigned short lo = word >> 16;
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unsigned long udisp22
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= lo + ((hi & 0x3F) << 16);
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long disp22 = (long)(udisp22 << 10) >> 10;
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disp22 += jr_fixup;
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hi = ((disp22 >> 16) & 0x3F) | 0x780;
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lo = disp22 & 0xFFFF;
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word = hi + (lo << 16);
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}
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dst[woffs] = word;
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}
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}
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}
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