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@@ -15,3 +15,103 @@ extern struct linux_romvec *romvec;
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/* Enumeration to describe the prom major version we have detected. */
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enum prom_major_version {
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+ PROM_V0, /* Original sun4c V0 prom */
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+ PROM_V2, /* sun4c and early sun4m V2 prom */
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+ PROM_V3, /* sun4m and later, up to sun4d/sun4e machines V3 */
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+ PROM_P1275, /* IEEE compliant ISA based Sun PROM, only sun4u */
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+};
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+
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+extern enum prom_major_version prom_vers;
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+/* Revision, and firmware revision. */
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+extern unsigned int prom_rev, prom_prev;
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+
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+/* Root node of the prom device tree, this stays constant after
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+ * initialization is complete.
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+ */
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+extern int prom_root_node;
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+
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+/* Pointer to prom structure containing the device tree traversal
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+ * and usage utility functions. Only prom-lib should use these,
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+ * users use the interface defined by the library only!
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+ */
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+extern struct linux_nodeops *prom_nodeops;
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+
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+/* The functions... */
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+
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+/* You must call prom_init() before using any of the library services,
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+ * preferably as early as possible. Pass it the romvec pointer.
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+ */
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+extern void prom_init(struct linux_romvec *rom_ptr);
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+
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+/* Boot argument acquisition, returns the boot command line string. */
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+extern char *prom_getbootargs(void);
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+
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+/* Device utilities. */
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+
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+/* Map and unmap devices in IO space at virtual addresses. Note that the
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+ * virtual address you pass is a request and the prom may put your mappings
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+ * somewhere else, so check your return value as that is where your new
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+ * mappings really are!
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+ *
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+ * Another note, these are only available on V2 or higher proms!
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+ */
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+extern char *prom_mapio(char *virt_hint, int io_space, unsigned int phys_addr, unsigned int num_bytes);
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+extern void prom_unmapio(char *virt_addr, unsigned int num_bytes);
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+
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+/* Device operations. */
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+
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+/* Open the device described by the passed string. Note, that the format
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+ * of the string is different on V0 vs. V2->higher proms. The caller must
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+ * know what he/she is doing! Returns the device descriptor, an int.
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+ */
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+extern int prom_devopen(char *device_string);
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+
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+/* Close a previously opened device described by the passed integer
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+ * descriptor.
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+ */
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+extern int prom_devclose(int device_handle);
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+
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+/* Do a seek operation on the device described by the passed integer
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+ * descriptor.
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+ */
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+extern void prom_seek(int device_handle, unsigned int seek_hival,
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+ unsigned int seek_lowval);
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+
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+/* Machine memory configuration routine. */
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+
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+/* This function returns a V0 format memory descriptor table, it has three
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+ * entries. One for the total amount of physical ram on the machine, one
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+ * for the amount of physical ram available, and one describing the virtual
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+ * areas which are allocated by the prom. So, in a sense the physical
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+ * available is a calculation of the total physical minus the physical mapped
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+ * by the prom with virtual mappings.
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+ *
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+ * These lists are returned pre-sorted, this should make your life easier
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+ * since the prom itself is way too lazy to do such nice things.
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+ */
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+extern struct linux_mem_v0 *prom_meminfo(void);
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+
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+/* Miscellaneous routines, don't really fit in any category per se. */
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+
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+/* Reboot the machine with the command line passed. */
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+extern void prom_reboot(char *boot_command);
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+
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+/* Evaluate the forth string passed. */
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+extern void prom_feval(char *forth_string);
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+
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+/* Enter the prom, with possibility of continuation with the 'go'
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+ * command in newer proms.
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+ */
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+extern void prom_cmdline(void);
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+
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+/* Enter the prom, with no chance of continuation for the stand-alone
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+ * which calls this.
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+ */
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+extern void prom_halt(void);
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+
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+/* Set the PROM 'sync' callback function to the passed function pointer.
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+ * When the user gives the 'sync' command at the prom prompt while the
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+ * kernel is still active, the prom will call this routine.
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+ *
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+ * XXX The arguments are different on V0 vs. V2->higher proms, grrr! XXX
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+ */
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李欣儒