esi.rar_interface

/* * Extensible SAL Interface (ESI) support routines. * * Copyright (C) 2006 Hewlett-Packard Co * Alex Williamson <alex.williamson@hp.com> */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/string.h> #include <asm/esi.h> #include <asm/sal.h> MODULE_AUTHOR("Alex Williamson <alex.williamson@hp.com>"); MODULE_DESCRIPTION("Extensible SAL Interface (ESI) support"); MODULE_LICENSE("GPL"); #define MODULE_NAME "esi" #define ESI_TABLE_GUID \ EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3, \ 0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4) enum esi_systab_entry_type { ESI_DESC_ENTRY_POINT = 0 }; /* * Entry type: Size: * 0 48 */ #define ESI_DESC_SIZE(type) "\060"[(unsigned) (type)] typedef struct ia64_esi_desc_entry_point { u8 type; u8 reserved1[15]; u64 esi_proc; u64 gp; efi_guid_t guid; } ia64_esi_desc_entry_point_t; struct pdesc { void *addr; void *gp; }; static struct ia64_sal_systab *esi_systab; static int __init esi_init (void) { efi_config_table_t *config_tables; struct ia64_sal_systab *systab; unsigned long esi = 0; char *p; int i; config_tables = __va(efi.systab->tables); for (i = 0; i < (int) efi.systab->nr_tables; ++i) { if (efi_guidcmp(config_tables[i].guid, ESI_TABLE_GUID) == 0) { esi = config_tables[i].table; break; } } if (!esi) return -ENODEV; systab = __va(esi); if (strncmp(systab->signature, "ESIT", 4) != 0) { printk(KERN_ERR "bad signature in ESI system table!"); return -ENODEV; } p = (char *) (systab + 1); for (i = 0; i < systab->entry_count; i++) { /* * The first byte of each entry type contains the type * descriptor. */ switch (*p) { case ESI_DESC_ENTRY_POINT: break; default: printk(KERN_WARNING "Unknown table type %d found in " "ESI table, ignoring rest of table\n", *p); return -ENODEV; } p += ESI_DESC_SIZE(*p); } esi_systab = systab; return 0; } int ia64_esi_call (efi_guid_t guid, struct ia64_sal_retval *isrvp, enum esi_proc_type proc_type, u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7) { struct ia64_fpreg fr[6]; unsigned long flags = 0; int i; char *p; if (!esi_systab) return -1; p = (char *) (esi_systab + 1); for (i = 0; i < esi_systab->entry_count; i++) { if (*p == ESI_DESC_ENTRY_POINT) { ia64_esi_desc_entry_point_t *esi = (void *)p; if (!efi_guidcmp(guid, esi->guid)) { ia64_sal_handler esi_proc; struct pdesc pdesc; pdesc.addr = __va(esi->esi_proc); pdesc.gp = __va(esi->gp); esi_proc = (ia64_sal_handler) &pdesc; ia64_save_scratch_fpregs(fr); if (proc_type == ESI_PROC_SERIALIZED) spin_lock_irqsave(&sal_lock, flags); else if (proc_type == ESI_PROC_MP_SAFE) local_irq_save(flags); else preempt_disable(); *isrvp = (*esi_proc)(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7); if (proc_type == ESI_PROC_SERIALIZED) spin_unlock_irqrestore(&sal_lock, flags); else if (proc_type == ESI_PROC_MP_SAFE) local_irq_restore(flags); else preempt_enable(); ia64_load_scratch_fpregs(fr); return 0; } } p += ESI_DESC_SIZE(*p); } return -1; } EXPORT_SYMBOL_GPL(ia64_esi_call); int ia64_esi_call_phys (efi_guid_t guid, struct ia64_sal_retval *isrvp, u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7) { struct ia64_fpreg fr[6]; unsigned long flags; u64 esi_params[8]; char *p; int i; if (!esi_systab) return -1; p = (char *) (esi_systab + 1); for (i = 0; i < esi_systab->entry_count; i++) { if (*p == ESI_DESC_ENTRY_POINT) { ia64_esi_desc_entry_point_t *esi = (void *)p; if (!efi_guidcmp(guid, esi->guid)) { ia64_sal_handler esi_proc; struct pdesc pdesc; pdesc.addr = (void *)esi->esi_proc; pdesc.gp = (void *)esi->gp; esi_proc = (ia64_sal_handler) &pdesc; esi_params[0] = func; esi_params[1] = arg1; esi_params[2] = arg2; esi_params[3] = arg3; esi_params[4] = arg4; esi_params[5] = arg5; esi_params[6] = arg6; esi_params[7] = arg7; ia64_save_scratch_fpregs(fr); spin_lock_irqsave(&sal_lock, flags); *isrvp = esi_call_phys(esi_proc, esi_params); spin_unlock_irqrestore(&sal_lock, flags); ia64_load_scratch_fpregs(fr); return 0; } } p += ESI_DESC_SIZE(*p); } return -1; } EXPORT_SYMBOL_GPL(ia64_esi_call_phys); static void __exit esi_exit (void) { } module_init(esi_init); module_exit(esi_exit); /* makes module removable... */