1 files changed, 137 insertions, 0 deletions
diff --git a/arch/mips/dec/prom/init.c b/arch/mips/dec/prom/init.c
new file mode 100644
index 000000000..cb12eb211
--- /dev/null
+++ b/arch/mips/dec/prom/init.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * init.c: PROM library initialisation code.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2002, 2004  Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/cpu-type.h>
+#include <asm/processor.h>
+
+#include <asm/dec/prom.h>
+
+
+int (*__rex_bootinit)(void);
+int (*__rex_bootread)(void);
+int (*__rex_getbitmap)(memmap *);
+unsigned long *(*__rex_slot_address)(int);
+void *(*__rex_gettcinfo)(void);
+int (*__rex_getsysid)(void);
+void (*__rex_clear_cache)(void);
+
+int (*__prom_getchar)(void);
+char *(*__prom_getenv)(char *);
+int (*__prom_printf)(char *, ...);
+
+int (*__pmax_open)(char*, int);
+int (*__pmax_lseek)(int, long, int);
+int (*__pmax_read)(int, void *, int);
+int (*__pmax_close)(int);
+
+
+/*
+ * Detect which PROM the DECSTATION has, and set the callback vectors
+ * appropriately.
+ */
+void __init which_prom(s32 magic, s32 *prom_vec)
+{
+	/*
+	 * No sign of the REX PROM's magic number means we assume a non-REX
+	 * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
+	 */
+	if (prom_is_rex(magic)) {
+		/*
+		 * Set up prom abstraction structure with REX entry points.
+		 */
+		__rex_bootinit =
+			(void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
+		__rex_bootread =
+			(void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
+		__rex_getbitmap =
+			(void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
+		__prom_getchar =
+			(void *)(long)*(prom_vec + REX_PROM_GETCHAR);
+		__prom_getenv =
+			(void *)(long)*(prom_vec + REX_PROM_GETENV);
+		__rex_getsysid =
+			(void *)(long)*(prom_vec + REX_PROM_GETSYSID);
+		__rex_gettcinfo =
+			(void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
+		__prom_printf =
+			(void *)(long)*(prom_vec + REX_PROM_PRINTF);
+		__rex_slot_address =
+			(void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
+		__rex_clear_cache =
+			(void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
+	} else {
+		/*
+		 * Set up prom abstraction structure with non-REX entry points.
+		 */
+		__prom_getchar = (void *)PMAX_PROM_GETCHAR;
+		__prom_getenv = (void *)PMAX_PROM_GETENV;
+		__prom_printf = (void *)PMAX_PROM_PRINTF;
+		__pmax_open = (void *)PMAX_PROM_OPEN;
+		__pmax_lseek = (void *)PMAX_PROM_LSEEK;
+		__pmax_read = (void *)PMAX_PROM_READ;
+		__pmax_close = (void *)PMAX_PROM_CLOSE;
+	}
+}
+
+void __init prom_init(void)
+{
+	extern void dec_machine_halt(void);
+	static const char cpu_msg[] __initconst =
+		"Sorry, this kernel is compiled for a wrong CPU type!\n";
+	s32 argc = fw_arg0;
+	s32 *argv = (void *)fw_arg1;
+	u32 magic = fw_arg2;
+	s32 *prom_vec = (void *)fw_arg3;
+
+	/*
+	 * Determine which PROM we have
+	 * (and therefore which machine we're on!)
+	 */
+	which_prom(magic, prom_vec);
+
+	if (prom_is_rex(magic))
+		rex_clear_cache();
+
+	/* Register the early console.  */
+	register_prom_console();
+
+	/* Were we compiled with the right CPU option? */
+#if defined(CONFIG_CPU_R3000)
+	if ((current_cpu_type() == CPU_R4000SC) ||
+	    (current_cpu_type() == CPU_R4400SC)) {
+		static const char r4k_msg[] __initconst =
+			"Please recompile with \"CONFIG_CPU_R4X00 = y\".\n";
+		printk(cpu_msg);
+		printk(r4k_msg);
+		dec_machine_halt();
+	}
+#endif
+
+#if defined(CONFIG_CPU_R4X00)
+	if ((current_cpu_type() == CPU_R3000) ||
+	    (current_cpu_type() == CPU_R3000A)) {
+		static const char r3k_msg[] __initconst =
+			"Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
+		printk(cpu_msg);
+		printk(r3k_msg);
+		dec_machine_halt();
+	}
+#endif
+
+	prom_meminit(magic);
+	prom_identify_arch(magic);
+	prom_init_cmdline(argc, argv, magic);
+}