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/*
 *  Xen domain firmware emulation support
 *  Copyright (C) 2004 Hewlett-Packard Co.
 *       Dan Magenheimer (dan.magenheimer@hp.com)
 *
 * Copyright (c) 2006, 2007
 *                    Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 *                    dom0 vp model support
 */

#ifdef __XEN__
#include <asm/system.h>
#include <asm/dom_fw_dom0.h>
#include <asm/dom_fw_utils.h>
#else
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <inttypes.h>

#include <xen/xen.h>
#include <asm/bundle.h>

#include "xg_private.h"
#include "xc_dom.h"
#include "ia64/xc_dom_ia64_util.h"

#define ia64_fc(addr)   asm volatile ("fc %0" :: "r"(addr) : "memory")
#endif /* __XEN__ */

#include <xen/acpi.h>
#include <acpi/actables.h>
#include <asm/dom_fw.h>
#include <asm/dom_fw_domu.h>

void
xen_ia64_efi_make_md(efi_memory_desc_t *md,
		     uint32_t type, uint64_t attr, 
		     uint64_t start, uint64_t end)
{
	md->type = type;
	md->pad = 0;
	md->phys_addr = start;
	md->virt_addr = 0;
	md->num_pages = (end - start) >> EFI_PAGE_SHIFT;
	md->attribute = attr;
}

#define EFI_HYPERCALL_PATCH(tgt, call)					\
	do {								\
		dom_efi_hypercall_patch(brkimm,				\
					FW_HYPERCALL_##call##_PADDR,	\
		                 FW_HYPERCALL_##call, hypercalls_imva);	\
		/* Descriptor address.  */                              \
		tables->efi_runtime.tgt =                               \
		                    FW_FIELD_MPA(func_ptrs) + 8 * pfn;  \
		/* Descriptor.  */                                      \
		tables->func_ptrs[pfn++] = FW_HYPERCALL_##call##_PADDR;	\
		tables->func_ptrs[pfn++] = 0;                     	\
	} while (0)

/**************************************************************************
Hypercall bundle creation
**************************************************************************/

static void
build_hypercall_bundle(uint64_t *imva, uint64_t brkimm, uint64_t hypnum, uint64_t ret)
{
	INST64_A5 slot0;
	INST64_I19 slot1;
	INST64_B4 slot2;
	IA64_BUNDLE bundle;

	// slot1: mov r2 = hypnum (low 20 bits)
	slot0.inst = 0;
	slot0.qp = 0; slot0.r1 = 2; slot0.r3 = 0; slot0.major = 0x9;
	slot0.imm7b = hypnum; slot0.imm9d = hypnum >> 7;
	slot0.imm5c = hypnum >> 16; slot0.s = 0;
	// slot1: break brkimm
	slot1.inst = 0;
	slot1.qp = 0; slot1.x6 = 0; slot1.x3 = 0; slot1.major = 0x0;
	slot1.imm20 = brkimm; slot1.i = brkimm >> 20;
	// if ret slot2:  br.ret.sptk.many rp
	// else   slot2:  br.cond.sptk.many rp
	slot2.inst = 0; slot2.qp = 0; slot2.p = 1; slot2.b2 = 0;
	slot2.wh = 0; slot2.d = 0; slot2.major = 0x0;
	if (ret) {
		slot2.btype = 4; slot2.x6 = 0x21;
	}
	else {
		slot2.btype = 0; slot2.x6 = 0x20;
	}
	
	bundle.i64[0] = 0; bundle.i64[1] = 0;
	bundle.template = 0x11;
	bundle.slot0 = slot0.inst; bundle.slot2 = slot2.inst;
	bundle.slot1a = slot1.inst; bundle.slot1b = slot1.inst >> 18;
	
	imva[0] = bundle.i64[0]; imva[1] = bundle.i64[1];
	ia64_fc(imva);
	ia64_fc(imva + 1);
}

static void
build_pal_hypercall_bundles(uint64_t *imva, uint64_t brkimm, uint64_t hypnum)
{
	extern unsigned long xen_ia64_pal_call_stub[];
	IA64_BUNDLE bundle;
	INST64_A5 slot_a5;
	INST64_M37 slot_m37;

	/*
	 * The source of the hypercall stub is
	 * the xen_ia64_pal_call_stub function defined in dom_fw_asm.S. 
	 */

	/* Copy the first bundle and patch the hypercall number.  */
	bundle.i64[0] = xen_ia64_pal_call_stub[0];
	bundle.i64[1] = xen_ia64_pal_call_stub[1];
	slot_a5.inst = bundle.slot0;
	slot_a5.imm7b = hypnum;
	slot_a5.imm9d = hypnum >> 7;
	slot_a5.imm5c = hypnum >> 16;
	bundle.slot0 = slot_a5.inst;
	imva[0] = bundle.i64[0];
	imva[1] = bundle.i64[1];
	ia64_fc(imva);
	ia64_fc(imva + 1);
	
	/* Copy the second bundle and patch the hypercall vector.  */
	bundle.i64[0] = xen_ia64_pal_call_stub[2];
	bundle.i64[1] = xen_ia64_pal_call_stub[3];
	slot_m37.inst = bundle.slot0;
	slot_m37.imm20a = brkimm;
	slot_m37.i = brkimm >> 20;
	bundle.slot0 = slot_m37.inst;
	imva[2] = bundle.i64[0];
	imva[3] = bundle.i64[1];
	ia64_fc(imva + 2);
	ia64_fc(imva + 3);
}

// builds a hypercall bundle at domain physical address
static void
dom_fpswa_hypercall_patch(uint64_t brkimm, unsigned long imva)
{
	unsigned long *entry_imva, *patch_imva;
	const unsigned long entry_paddr = FW_HYPERCALL_FPSWA_ENTRY_PADDR;
	const unsigned long patch_paddr = FW_HYPERCALL_FPSWA_PATCH_PADDR;

	entry_imva = (unsigned long *)(imva + entry_paddr -
	                               FW_HYPERCALL_BASE_PADDR);
	patch_imva = (unsigned long *)(imva + patch_paddr -
	                               FW_HYPERCALL_BASE_PADDR);

	/* Descriptor.  */
	*entry_imva++ = patch_paddr;
	*entry_imva   = 0;

	build_hypercall_bundle(patch_imva, brkimm, FW_HYPERCALL_FPSWA, 1);
}

// builds a hypercall bundle at domain physical address
static void
dom_efi_hypercall_patch(uint64_t brkimm, unsigned long paddr,
                        unsigned long hypercall, unsigned long imva)
{
	build_hypercall_bundle((uint64_t *)(imva + paddr -
			       FW_HYPERCALL_BASE_PADDR),
			       brkimm, hypercall, 1);
}

// builds a hypercall bundle at domain physical address
static void
dom_fw_hypercall_patch(uint64_t brkimm, unsigned long paddr,
		       unsigned long hypercall,unsigned long ret,
                       unsigned long imva)
{
	build_hypercall_bundle((uint64_t *)(imva + paddr -
			       FW_HYPERCALL_BASE_PADDR),
			       brkimm, hypercall, ret);
}

static void
dom_fw_pal_hypercall_patch(uint64_t brkimm, unsigned long paddr, unsigned long imva)
{
	build_pal_hypercall_bundles((uint64_t*)(imva + paddr -
	                            FW_HYPERCALL_BASE_PADDR),
	                            brkimm, FW_HYPERCALL_PAL_CALL);
}

static inline void
print_md(efi_memory_desc_t *md)
{
	uint64_t size;
	
	printk(XENLOG_INFO "dom mem: type=%2u, attr=0x%016lx, "
	       "range=[0x%016lx-0x%016lx) ",
	       md->type, md->attribute, md->phys_addr,
	       md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT));

	size = md->num_pages << EFI_PAGE_SHIFT;
	if (size > ONE_MB)
		printk("(%luMB)\n", size >> 20);
	else
		printk("(%luKB)\n", size >> 10);
}

struct fake_acpi_tables {
	struct acpi_table_rsdp rsdp;
	struct acpi_table_xsdt xsdt;
	uint64_t madt_ptr;
	struct acpi_table_fadt fadt;
	struct acpi_table_facs facs;
	struct acpi_table_header dsdt;
	uint8_t aml[8 + 11 * MAX_VIRT_CPUS];
	struct acpi_table_madt madt;
	struct acpi_table_lsapic lsapic[MAX_VIRT_CPUS];
	uint8_t pm1a_event_block[4];
	uint8_t pm1a_control_block[1];
	uint8_t pm_timer_block[4];
};
#define ACPI_TABLE_MPA(field)                                       \
    FW_ACPI_BASE_PADDR + offsetof(struct fake_acpi_tables, field);

/* Create enough of an ACPI structure to make the guest OS ACPI happy. */
void
dom_fw_fake_acpi(domain_t *d, struct fake_acpi_tables *tables)
{
	struct acpi_table_rsdp *rsdp = &tables->rsdp;
	struct acpi_table_xsdt *xsdt = &tables->xsdt;
	struct acpi_table_fadt *fadt = &tables->fadt;
	struct acpi_table_facs *facs = &tables->facs;
	struct acpi_table_header *dsdt = &tables->dsdt;
	struct acpi_table_madt *madt = &tables->madt;
	struct acpi_table_lsapic *lsapic = tables->lsapic;
	int i;
	int aml_len;
	int nbr_cpus;

	BUILD_BUG_ON(sizeof(struct fake_acpi_tables) >
	             (FW_ACPI_END_PADDR - FW_ACPI_BASE_PADDR));

	memset(tables, 0, sizeof(struct fake_acpi_tables));

	/* setup XSDT (64bit version of RSDT) */
	memcpy(xsdt->header.signature, ACPI_SIG_XSDT,
	       sizeof(xsdt->header.signature));
	/* XSDT points to both the FADT and the MADT, so add one entry */
	xsdt->header.length = sizeof(struct acpi_table_xsdt) + sizeof(uint64_t);
	xsdt->header.revision = 1;
	memcpy(xsdt->header.oem_id, "XEN", 3);
	memcpy(xsdt->header.oem_table_id, "Xen/ia64", 8);
	memcpy(xsdt->header.asl_compiler_id, "XEN", 3);
	xsdt->header.asl_compiler_revision = xen_ia64_version(d);

	xsdt->table_offset_entry[0] = ACPI_TABLE_MPA(fadt);
	tables->madt_ptr = ACPI_TABLE_MPA(madt);

	xsdt->header.checksum = -acpi_tb_checksum((u8*)xsdt,
						  xsdt->header.length);

	/* setup FADT */
	memcpy(fadt->header.signature, ACPI_SIG_FADT,
	       sizeof(fadt->header.signature));
	fadt->header.length = sizeof(struct acpi_table_fadt);
	fadt->header.revision = FADT2_REVISION_ID;
	memcpy(fadt->header.oem_id, "XEN", 3);
	memcpy(fadt->header.oem_table_id, "Xen/ia64", 8);
	memcpy(fadt->header.asl_compiler_id, "XEN", 3);
	fadt->header.asl_compiler_revision = xen_ia64_version(d);

	memcpy(facs->signature, ACPI_SIG_FACS, sizeof(facs->signature));
	facs->version = 1;
	facs->length = sizeof(struct acpi_table_facs);

	fadt->Xfacs = ACPI_TABLE_MPA(facs);
	fadt->Xdsdt = ACPI_TABLE_MPA(dsdt);

	/*
	 * All of the below FADT entries are filled it to prevent warnings
	 * from sanity checks in the ACPI CA.  Emulate required ACPI hardware
	 * registers in system memory.
	 */
	fadt->pm1_event_length = 4;
	fadt->xpm1a_event_block.space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
	fadt->xpm1a_event_block.bit_width = 8;
	fadt->xpm1a_event_block.address = ACPI_TABLE_MPA(pm1a_event_block);
	fadt->pm1_control_length = 1;
	fadt->xpm1a_control_block.space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
	fadt->xpm1a_control_block.bit_width = 8;
	fadt->xpm1a_control_block.address = ACPI_TABLE_MPA(pm1a_control_block);
	fadt->pm_timer_length = 4;
	fadt->xpm_timer_block.space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
	fadt->xpm_timer_block.bit_width = 8;
	fadt->xpm_timer_block.address = ACPI_TABLE_MPA(pm_timer_block);

	fadt->header.checksum = -acpi_tb_checksum((u8*)fadt,
						  fadt->header.length);

	/* setup RSDP */
	memcpy(rsdp->signature, ACPI_SIG_RSDP, strlen(ACPI_SIG_RSDP));
	memcpy(rsdp->oem_id, "XEN", 3);
	rsdp->revision = 2; /* ACPI 2.0 includes XSDT */
	rsdp->length = sizeof(struct acpi_table_rsdp);
	rsdp->xsdt_physical_address = ACPI_TABLE_MPA(xsdt);

	rsdp->checksum = -acpi_tb_checksum((u8*)rsdp,
					   ACPI_RSDP_CHECKSUM_LENGTH);
	rsdp->extended_checksum = -acpi_tb_checksum((u8*)rsdp, rsdp->length);

	/* setup DSDT with trivial namespace. */ 
	memcpy(dsdt->signature, ACPI_SIG_DSDT, strlen(ACPI_SIG_DSDT));
	dsdt->revision = 1;
	memcpy(dsdt->oem_id, "XEN", 3);
	memcpy(dsdt->oem_table_id, "Xen/ia64", 8);
	memcpy(dsdt->asl_compiler_id, "XEN", 3);
	dsdt->asl_compiler_revision = xen_ia64_version(d);

	/* Trivial namespace, avoids ACPI CA complaints */
	tables->aml[0] = 0x10; /* Scope */
	tables->aml[1] = 0x40; /* length/offset to next object (patched) */
	tables->aml[2] = 0x00;
	memcpy(&tables->aml[3], "_SB_", 4);

	/* The processor object isn't absolutely necessary, revist for SMP */
	aml_len = 7;
	for (i = 0; i < 3; i++) {
		unsigned char *p = tables->aml + aml_len;
		p[0] = 0x5b; /* processor object */
		p[1] = 0x83;
		p[2] = 0x0b; /* next */
		p[3] = 'C';
		p[4] = 'P';
		snprintf ((char *)p + 5, 3, "%02x", i);
		if (i < 16)
			p[5] = 'U';
		p[7] = i;	/* acpi_id */
		p[8] = 0;	/* pblk_addr */


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