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c0019f5768
Instead of iterating over the EFI config table array manually, declare it as an arch table so it gets picked up by the existing config table handling code. Tested-by: Tony Luck <tony.luck@intel.com> # arch/ia64 Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
194 lines
4.2 KiB
C
194 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Extensible SAL Interface (ESI) support routines.
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*
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* Copyright (C) 2006 Hewlett-Packard Co
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* Alex Williamson <alex.williamson@hp.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/esi.h>
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#include <asm/sal.h>
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MODULE_AUTHOR("Alex Williamson <alex.williamson@hp.com>");
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MODULE_DESCRIPTION("Extensible SAL Interface (ESI) support");
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MODULE_LICENSE("GPL");
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#define MODULE_NAME "esi"
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enum esi_systab_entry_type {
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ESI_DESC_ENTRY_POINT = 0
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};
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/*
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* Entry type: Size:
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* 0 48
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*/
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#define ESI_DESC_SIZE(type) "\060"[(unsigned) (type)]
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typedef struct ia64_esi_desc_entry_point {
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u8 type;
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u8 reserved1[15];
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u64 esi_proc;
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u64 gp;
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efi_guid_t guid;
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} ia64_esi_desc_entry_point_t;
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struct pdesc {
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void *addr;
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void *gp;
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};
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static struct ia64_sal_systab *esi_systab;
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extern unsigned long esi_phys;
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static int __init esi_init (void)
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{
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struct ia64_sal_systab *systab;
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char *p;
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int i;
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if (esi_phys == EFI_INVALID_TABLE_ADDR)
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return -ENODEV;
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systab = __va(esi_phys);
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if (strncmp(systab->signature, "ESIT", 4) != 0) {
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printk(KERN_ERR "bad signature in ESI system table!");
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return -ENODEV;
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}
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p = (char *) (systab + 1);
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for (i = 0; i < systab->entry_count; i++) {
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/*
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* The first byte of each entry type contains the type
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* descriptor.
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*/
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switch (*p) {
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case ESI_DESC_ENTRY_POINT:
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break;
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default:
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printk(KERN_WARNING "Unknown table type %d found in "
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"ESI table, ignoring rest of table\n", *p);
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return -ENODEV;
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}
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p += ESI_DESC_SIZE(*p);
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}
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esi_systab = systab;
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return 0;
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}
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int ia64_esi_call (efi_guid_t guid, struct ia64_sal_retval *isrvp,
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enum esi_proc_type proc_type, u64 func,
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u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
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u64 arg7)
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{
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struct ia64_fpreg fr[6];
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unsigned long flags = 0;
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int i;
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char *p;
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if (!esi_systab)
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return -1;
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p = (char *) (esi_systab + 1);
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for (i = 0; i < esi_systab->entry_count; i++) {
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if (*p == ESI_DESC_ENTRY_POINT) {
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ia64_esi_desc_entry_point_t *esi = (void *)p;
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if (!efi_guidcmp(guid, esi->guid)) {
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ia64_sal_handler esi_proc;
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struct pdesc pdesc;
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pdesc.addr = __va(esi->esi_proc);
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pdesc.gp = __va(esi->gp);
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esi_proc = (ia64_sal_handler) &pdesc;
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ia64_save_scratch_fpregs(fr);
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if (proc_type == ESI_PROC_SERIALIZED)
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spin_lock_irqsave(&sal_lock, flags);
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else if (proc_type == ESI_PROC_MP_SAFE)
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local_irq_save(flags);
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else
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preempt_disable();
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*isrvp = (*esi_proc)(func, arg1, arg2, arg3,
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arg4, arg5, arg6, arg7);
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if (proc_type == ESI_PROC_SERIALIZED)
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spin_unlock_irqrestore(&sal_lock,
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flags);
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else if (proc_type == ESI_PROC_MP_SAFE)
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local_irq_restore(flags);
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else
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preempt_enable();
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ia64_load_scratch_fpregs(fr);
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return 0;
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}
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}
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p += ESI_DESC_SIZE(*p);
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}
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return -1;
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}
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EXPORT_SYMBOL_GPL(ia64_esi_call);
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int ia64_esi_call_phys (efi_guid_t guid, struct ia64_sal_retval *isrvp,
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u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4,
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u64 arg5, u64 arg6, u64 arg7)
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{
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struct ia64_fpreg fr[6];
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unsigned long flags;
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u64 esi_params[8];
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char *p;
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int i;
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if (!esi_systab)
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return -1;
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p = (char *) (esi_systab + 1);
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for (i = 0; i < esi_systab->entry_count; i++) {
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if (*p == ESI_DESC_ENTRY_POINT) {
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ia64_esi_desc_entry_point_t *esi = (void *)p;
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if (!efi_guidcmp(guid, esi->guid)) {
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ia64_sal_handler esi_proc;
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struct pdesc pdesc;
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pdesc.addr = (void *)esi->esi_proc;
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pdesc.gp = (void *)esi->gp;
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esi_proc = (ia64_sal_handler) &pdesc;
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esi_params[0] = func;
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esi_params[1] = arg1;
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esi_params[2] = arg2;
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esi_params[3] = arg3;
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esi_params[4] = arg4;
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esi_params[5] = arg5;
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esi_params[6] = arg6;
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esi_params[7] = arg7;
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ia64_save_scratch_fpregs(fr);
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spin_lock_irqsave(&sal_lock, flags);
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*isrvp = esi_call_phys(esi_proc, esi_params);
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spin_unlock_irqrestore(&sal_lock, flags);
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ia64_load_scratch_fpregs(fr);
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return 0;
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}
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}
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p += ESI_DESC_SIZE(*p);
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}
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return -1;
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}
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EXPORT_SYMBOL_GPL(ia64_esi_call_phys);
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static void __exit esi_exit (void)
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{
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}
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module_init(esi_init);
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module_exit(esi_exit); /* makes module removable... */
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