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/*
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 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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 *
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 * Copyright (c) 2004-2007 Fabrice Bellard
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 * Copyright (c) 2007 Jocelyn Mayer
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 * Copyright (c) 2010 David Gibson, IBM Corporation.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 *
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 */
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#include "sysemu.h"
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#include "qemu-char.h"
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#include "hw.h"
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#include "elf.h"
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#include "hw/boards.h"
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#include "hw/ppc.h"
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#include "hw/loader.h"
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#include "hw/spapr.h"
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#include <libfdt.h>
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#define KERNEL_LOAD_ADDR        0x00000000
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#define INITRD_LOAD_ADDR        0x02800000
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#define FDT_MAX_SIZE            0x10000
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#define TIMEBASE_FREQ           512000000ULL
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#define MAX_CPUS                32
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sPAPREnvironment *spapr;
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static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
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                              const char *cpu_model, CPUState *envs[],
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                              sPAPREnvironment *spapr,
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                              target_phys_addr_t initrd_base,
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                              target_phys_addr_t initrd_size,
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                              const char *kernel_cmdline)
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{
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    void *fdt;
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    uint64_t mem_reg_property[] = { 0, cpu_to_be64(ramsize) };
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    uint32_t start_prop = cpu_to_be32(initrd_base);
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    uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
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    int i;
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    char *modelname;
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#define _FDT(exp) \
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    do { \
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        int ret = (exp);                                           \
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        if (ret < 0) {                                             \
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            fprintf(stderr, "qemu: error creating device tree: %s: %s\n", \
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                    #exp, fdt_strerror(ret));                      \
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            exit(1);                                               \
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        }                                                          \
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    } while (0)
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    fdt = qemu_mallocz(FDT_MAX_SIZE);
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    _FDT((fdt_create(fdt, FDT_MAX_SIZE)));
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    _FDT((fdt_finish_reservemap(fdt)));
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    /* Root node */
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    _FDT((fdt_begin_node(fdt, "")));
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    _FDT((fdt_property_string(fdt, "device_type", "chrp")));
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    _FDT((fdt_property_string(fdt, "model", "qemu,emulated-pSeries-LPAR")));
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    _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
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    _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));
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    /* /chosen */
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    _FDT((fdt_begin_node(fdt, "chosen")));
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    _FDT((fdt_property_string(fdt, "bootargs", kernel_cmdline)));
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    _FDT((fdt_property(fdt, "linux,initrd-start",
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                       &start_prop, sizeof(start_prop))));
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    _FDT((fdt_property(fdt, "linux,initrd-end",
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                       &end_prop, sizeof(end_prop))));
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    _FDT((fdt_end_node(fdt)));
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    /* memory node */
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    _FDT((fdt_begin_node(fdt, "memory@0")));
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    _FDT((fdt_property_string(fdt, "device_type", "memory")));
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    _FDT((fdt_property(fdt, "reg",
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                       mem_reg_property, sizeof(mem_reg_property))));
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    _FDT((fdt_end_node(fdt)));
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    /* cpus */
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    _FDT((fdt_begin_node(fdt, "cpus")));
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    _FDT((fdt_property_cell(fdt, "#address-cells", 0x1)));
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    _FDT((fdt_property_cell(fdt, "#size-cells", 0x0)));
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    modelname = qemu_strdup(cpu_model);
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    for (i = 0; i < strlen(modelname); i++) {
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        modelname[i] = toupper(modelname[i]);
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    }
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    for (i = 0; i < smp_cpus; i++) {
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        CPUState *env = envs[i];
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        char *nodename;
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        uint32_t segs[] = {cpu_to_be32(28), cpu_to_be32(40),
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                           0xffffffff, 0xffffffff};
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        if (asprintf(&nodename, "%s@%x", modelname, i) < 0) {
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            fprintf(stderr, "Allocation failure\n");
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            exit(1);
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        }
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        _FDT((fdt_begin_node(fdt, nodename)));
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        free(nodename);
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        _FDT((fdt_property_cell(fdt, "reg", i)));
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        _FDT((fdt_property_string(fdt, "device_type", "cpu")));
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        _FDT((fdt_property_cell(fdt, "cpu-version", env->spr[SPR_PVR])));
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        _FDT((fdt_property_cell(fdt, "dcache-block-size",
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                                env->dcache_line_size)));
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        _FDT((fdt_property_cell(fdt, "icache-block-size",
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                                env->icache_line_size)));
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        _FDT((fdt_property_cell(fdt, "timebase-frequency", TIMEBASE_FREQ)));
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        /* Hardcode CPU frequency for now.  It's kind of arbitrary on
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         * full emu, for kvm we should copy it from the host */
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        _FDT((fdt_property_cell(fdt, "clock-frequency", 1000000000)));
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        _FDT((fdt_property_cell(fdt, "ibm,slb-size", env->slb_nr)));
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        _FDT((fdt_property_string(fdt, "status", "okay")));
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        _FDT((fdt_property(fdt, "64-bit", NULL, 0)));
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        if (envs[i]->mmu_model & POWERPC_MMU_1TSEG) {
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            _FDT((fdt_property(fdt, "ibm,processor-segment-sizes",
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                               segs, sizeof(segs))));
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        }
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        _FDT((fdt_end_node(fdt)));
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    }
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    qemu_free(modelname);
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    _FDT((fdt_end_node(fdt)));
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    _FDT((fdt_end_node(fdt))); /* close root node */
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    _FDT((fdt_finish(fdt)));
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    *fdt_size = fdt_totalsize(fdt);
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    return fdt;
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}
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static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
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{
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    return (addr & 0x0fffffff) + KERNEL_LOAD_ADDR;
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}
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static void emulate_spapr_hypercall(CPUState *env)
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{
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    env->gpr[3] = spapr_hypercall(env, env->gpr[3], &env->gpr[4]);
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}
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/* FIXME: hack until we implement the proper VIO console */
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static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
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                                    target_ulong opcode, target_ulong *args)
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{
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    uint8_t buf[16];
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    stq_p(buf, args[2]);
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    stq_p(buf + 8, args[3]);
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    qemu_chr_write(serial_hds[0], buf, args[1]);
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    return 0;
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}
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/* pSeries LPAR / sPAPR hardware init */
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static void ppc_spapr_init(ram_addr_t ram_size,
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                           const char *boot_device,
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                           const char *kernel_filename,
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                           const char *kernel_cmdline,
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                           const char *initrd_filename,
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                           const char *cpu_model)
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{
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    CPUState *envs[MAX_CPUS];
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    void *fdt;
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    int i;
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    ram_addr_t ram_offset;
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    target_phys_addr_t fdt_addr;
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    uint32_t kernel_base, initrd_base;
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    long kernel_size, initrd_size;
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    int fdt_size;
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    spapr = qemu_malloc(sizeof(*spapr));
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    cpu_ppc_hypercall = emulate_spapr_hypercall;
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    /* We place the device tree just below either the top of RAM, or
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     * 2GB, so that it can be processed with 32-bit code if
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     * necessary */
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    fdt_addr = MIN(ram_size, 0x80000000) - FDT_MAX_SIZE;
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    /* init CPUs */
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    if (cpu_model == NULL) {
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        cpu_model = "POWER7";
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    }
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    for (i = 0; i < smp_cpus; i++) {
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        CPUState *env = cpu_init(cpu_model);
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        if (!env) {
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            fprintf(stderr, "Unable to find PowerPC CPU definition\n");
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            exit(1);
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        }
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        /* Set time-base frequency to 512 MHz */
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        cpu_ppc_tb_init(env, TIMEBASE_FREQ);
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        qemu_register_reset((QEMUResetHandler *)&cpu_reset, env);
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        env->hreset_vector = 0x60;
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        env->hreset_excp_prefix = 0;
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        env->gpr[3] = i;
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        envs[i] = env;
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    }
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    /* allocate RAM */
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    ram_offset = qemu_ram_alloc(NULL, "ppc_spapr.ram", ram_size);
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    cpu_register_physical_memory(0, ram_size, ram_offset);
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    spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
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    if (kernel_filename) {
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        uint64_t lowaddr = 0;
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        kernel_base = KERNEL_LOAD_ADDR;
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        kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
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                               NULL, &lowaddr, NULL, 1, ELF_MACHINE, 0);
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        if (kernel_size < 0) {
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            kernel_size = load_image_targphys(kernel_filename, kernel_base,
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                                              ram_size - kernel_base);
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        }
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        if (kernel_size < 0) {
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            fprintf(stderr, "qemu: could not load kernel '%s'\n",
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                    kernel_filename);
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            exit(1);
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        }
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        /* load initrd */
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        if (initrd_filename) {
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            initrd_base = INITRD_LOAD_ADDR;
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            initrd_size = load_image_targphys(initrd_filename, initrd_base,
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                                              ram_size - initrd_base);
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            if (initrd_size < 0) {
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                fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
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                        initrd_filename);
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                exit(1);
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            }
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        } else {
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            initrd_base = 0;
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            initrd_size = 0;
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        }
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    } else {
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        fprintf(stderr, "pSeries machine needs -kernel for now");
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        exit(1);
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    }
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    /* Prepare the device tree */
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    fdt = spapr_create_fdt(&fdt_size, ram_size, cpu_model, envs, spapr,
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                           initrd_base, initrd_size, kernel_cmdline);
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    assert(fdt != NULL);
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    cpu_physical_memory_write(fdt_addr, fdt, fdt_size);
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    qemu_free(fdt);
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    envs[0]->gpr[3] = fdt_addr;
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    envs[0]->gpr[5] = 0;
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    envs[0]->hreset_vector = kernel_base;
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}
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static QEMUMachine spapr_machine = {
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    .name = "pseries",
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    .desc = "pSeries Logical Partition (PAPR compliant)",
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    .init = ppc_spapr_init,
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    .max_cpus = MAX_CPUS,
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    .no_vga = 1,
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    .no_parallel = 1,
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};
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static void spapr_machine_init(void)
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{
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    qemu_register_machine(&spapr_machine);
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}
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machine_init(spapr_machine_init);