1 files changed, 101 insertions, 0 deletions
diff --git a/os/boot/rpcg/initpaq.c b/os/boot/rpcg/initpaq.c
new file mode 100644
index 00000000..d10d92ce
--- /dev/null
+++ b/os/boot/rpcg/initpaq.c
@@ -0,0 +1,101 @@
+/*
+ * Called from l.s in EPROM to set up a minimal working environment.
+ * Since there is no DRAM yet, and therefore no stack, no function
+ * calls may be made from sysinit0, and values can't be stored,
+ * except to INTMEM.  Global values are accessed by offset from SB,
+ * which has been set by l.s to point into EPROM.
+ *
+ * This is PowerPAQ-specific:
+ *	- assumes 8mbytes
+ *	- powerpaq CS assignment
+ */
+
+#include "u.h"
+#include "lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+#include "io.h"
+
+#include "archpaq.h"
+
+#define	MB	(1024*1024)
+
+enum {
+	DRAMSIZE = 8*MB,
+	FLASHSIZE = 8*MB,
+
+	UPMSIZE = 64,	/* memory controller instruction RAM */
+	SPEED = 50,	/* maximum memory clock in MHz */
+
+	/* mcr */
+	WriteRAM = 0<<30,
+	ReadRAM = 1<<30,
+	ExecRAM = 2<<30,
+
+	SelUPMA = 0<<23,
+	SelUPMB = 1<<23,
+
+	Once = 1<<8,
+};
+
+/*
+ * mpc8bug uses the following for 60ns EDO DRAMs 32-50MHz
+ */
+static ulong upmb50[UPMSIZE] = {
+	0x8FFFEC24,	0xFFFEC04,	0xCFFEC04,	0xFFEC04,       
+	0xFFEC00,	0x37FFEC47,	0xFFFFFFFF,	0xFFFFFFFF,
+	0x8FFFEC24,	0xFFFEC04,	0x8FFEC04,	0xFFEC0C,
+	0x3FFEC00,	0xFFEC44,	0xFFCC08,	0xCFFCC44,
+	0xFFEC0C,	0x3FFEC00,	0xFFEC44,	0xFFCC00,
+	0x3FFFC847,	0x3FFFEC47,	0xFFFFFFFF,	0xFFFFFFFF,
+	0x8FAFCC24,	0xFAFCC04,	0xCAFCC00,	0x11BFCC47,
+	0xC0FFCC84,	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,
+	0x8FAFCC24,	0xFAFCC04,	0xCAFCC00,	0x3AFCC4C,
+	0xCAFCC00,	0x3AFCC4C,	0xCAFCC00,	0x3AFCC4C,
+	0xCAFCC00,	0x33BFCC4F,	0xFFFFFFFF,	0xFFFFFFFF,
+	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,
+	0xC0FFCC84,	0xFFCC04,	0x7FFCC04,	0x3FFFCC06,
+	0xFFFFCC85,	0xFFFFCC05,	0xFFFFCC05,	0xFFFFFFFF,
+	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,
+	0x33FFCC07,	0xFFFFFFFF,	0xFFFFFFFF,	0xFFFFFFFF,
+};
+
+void
+sysinit0(int inrom)
+{
+	ulong *upm;
+	IMM *io;
+	int i;
+
+	io = (IMM*)INTMEM;		/* running before maps, no KADDR */
+
+	/* system interface unit initialisation, FADS manual table 3-2, except as noted */
+	io->siumcr = 0x01012440;
+	io->sypcr = 0xFFFFFF88;
+	io->tbscrk = KEEP_ALIVE_KEY;
+	io->tbscr = 0xC3;	/* time base enabled */
+	io->rtcsck = KEEP_ALIVE_KEY;
+	io->rtcsc = 0xC1;	/* don't FRZ, real-time clock enabled */
+	io->rtcsck = ~KEEP_ALIVE_KEY;
+	io->piscrk = KEEP_ALIVE_KEY;
+	io->piscr = 0x82;
+
+	io->memc[BOOTCS].base = FLASHMEM | 1;
+	io->memc[BOOTCS].option = ~(FLASHSIZE-1)|(1<<8)|(2<<4);	/* mask, BIH, 2 wait states */
+
+	if(!inrom)
+		return;	/* can't initialise DRAM controller from DRAM */
+
+	/* could check DRAM speed here; assume 60ns */
+	/* could probe DRAM for size here; assume DRAMSIZE */
+	io->mptpr = 0x400;	/* powerpaq flash has 0x1000 */
+	io->mbmr = (0xC0<<24) | 0xA21114;	/* 50MHz BRGCLK */
+	upm = upmb50;
+	for(i=0; i<UPMSIZE; i++){
+		io->mdr = upm[i];
+		io->mcr = WriteRAM | SelUPMB | i;
+	}
+	io->memc[DRAM1].option = ~(DRAMSIZE-1)|0x0800;	/* address mask, SAM=1 */
+	io->memc[DRAM1].base = 0 | 0xC1;	/* base at 0, 32-bit port size, no parity, UPMB */
+}