[src/trunk]: src/sys/arch/hpcmips/stand/romboot run cached and move fast.

[shin <shin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2bb86885e7e4
branches:  trunk
changeset: 522308:2bb86885e7e4
user:      shin <shin%NetBSD.org@localhost>
date:      Sat Feb 16 05:26:02 2002 +0000

description:
run cached and move fast.
        before  5 seconds
        after   sub second

diffstat:

 sys/arch/hpcmips/stand/romboot/romboot.S |  26 ++++++++++++++++++++------
 1 files changed, 20 insertions(+), 6 deletions(-)

diffs (66 lines):

diff -r d2bb3c3b9ad5 -r 2bb86885e7e4 sys/arch/hpcmips/stand/romboot/romboot.S
--- a/sys/arch/hpcmips/stand/romboot/romboot.S  Sat Feb 16 05:19:26 2002 +0000
+++ b/sys/arch/hpcmips/stand/romboot/romboot.S  Sat Feb 16 05:26:02 2002 +0000
@@ -1,7 +1,7 @@
-/*     $NetBSD: romboot.S,v 1.5 2002/02/13 12:02:49 shin Exp $ */
+/*     $NetBSD: romboot.S,v 1.6 2002/02/16 05:26:02 shin Exp $ */
 
 /*-
- * Copyright (c) 2001 Takao Shinohara.
+ * Copyright (c) 2001, 2002 Takao Shinohara.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -65,8 +65,12 @@
 #define s8     $30
 #define ra     $31
 
+#define MIPS_KSEG0_START       0x80000000
 #define MIPS_KSEG1_START       0xa0000000
+#define KSEG1_KSEG0_DIFF       (MIPS_KSEG1_START - MIPS_KSEG0_START)
 #define KERNEL_LOADADDR                0x80001000
+#define MAX_KERNEL_SIZE                (1024*1024*6)   # 6MB
+#define MAX_DCACHE_SIZE                (1024*32)       # 32KB
 
        .text
        .set    noreorder
@@ -74,18 +78,21 @@
 _start:
        bal     1f                      # ra = ROM address + 8
        nop
-1:     subu    a0, ra, 8               # a0 = ROM address
+1:     subu    a0, ra, 8               # a0 = ROM address(kseg1)
+       subu    a0, KSEG1_KSEG0_DIFF    # convert to kseg0 address
        move    s0, a0                  # keep it in s0 
        la      t0, _etext
        la      t1, _ftext
        subu    t0, t1                  # t0 = size of boot loader
        addu    a0, t0                  # a0 = kernel address in ROM
        li      a1, KERNEL_LOADADDR
-       li      t2, (1024*1024*6)       # max kernel size = 6MB - boot
+       li      t2, MAX_KERNEL_SIZE     # max kernel size = 6MB - boot
        subu    t2, t0
        addu    t2, a1                  # kernel end address
-       or      a1, MIPS_KSEG1_START    # convert to kseg1 addr
-       or      t2, MIPS_KSEG1_START    # convert to kseg1 addr
+       la      t9, 2f
+       addu    t9, s0
+       jr      t9                      # jump to cached address
+       nop
 2:
        lw      v0, 0(a0)
        sw      v0, 0(a1)
@@ -93,6 +100,13 @@
        bltu    a1, t2, 2b
        addu    a1, 4                   # BDSLOT
 
+       /* purge data cache */
+       li      v0, MAX_DCACHE_SIZE
+3:     lw      zero, 0(a1)
+       addu    a1, 4
+       bnez    v0, 3b
+       subu    v0, 4                   # BDSLOT
+
        li      sp, KERNEL_LOADADDR     # initialize stack pointer
        li      a0, 1                   # argc = 1
        addu    a1, sp, -16             # argv