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..cc988bbd2
--- /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);
+}