#include "apic.h"
#include <common/kprint.h>
#include <common/printk.h>
#include <common/cpu.h>
#include <common/glib.h>
#include <exception/gate.h>
#include <driver/acpi/acpi.h>
#include <exception/softirq.h>
#include <process/process.h>
#include <sched/sched.h>
#pragma GCC push_options
#pragma GCC optimize("O0")
// 导出定义在irq.c中的中段门表
extern void (*interrupt_table[24])(void);
static bool flag_support_apic = false;
static bool flag_support_x2apic = false;
uint8_t __apic_enable_state = APIC_XAPIC_ENABLED;
static uint local_apic_version;
static uint local_apic_max_LVT_entries;
static struct acpi_Multiple_APIC_Description_Table_t *madt;
static struct acpi_IO_APIC_Structure_t *io_apic_ICS;
static void __local_apic_xapic_init();
static void __local_apic_x2apic_init();
static __always_inline void __send_eoi()
{
if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
{
__asm__ __volatile__("movq $0x00, %%rdx \n\t"
"movq $0x00, %%rax \n\t"
"movq $0x80b, %%rcx \n\t"
"wrmsr \n\t" ::
: "memory");
}
else
{
io_mfence();
__write4b(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_EOI, 0);
io_mfence();
}
}
/**
* @brief 初始化io_apic
*
*/
void apic_io_apic_init()
{
ul madt_addr;
acpi_iter_SDT(acpi_get_MADT, &madt_addr);
madt = (struct acpi_Multiple_APIC_Description_Table_t *)madt_addr;
// kdebug("MADT->local intr controller addr=%#018lx", madt->Local_Interrupt_Controller_Address);
// kdebug("MADT->length= %d bytes", madt->header.Length);
// 寻找io apic的ICS
void *ent = (void *)(madt_addr) + sizeof(struct acpi_Multiple_APIC_Description_Table_t);
struct apic_Interrupt_Controller_Structure_header_t *header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
while (header->length > 2)
{
header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
if (header->type == 1)
{
struct acpi_IO_APIC_Structure_t *t = (struct acpi_IO_APIC_Structure_t *)ent;
// kdebug("IO apic addr = %#018lx", t->IO_APIC_Address);
io_apic_ICS = t;
break;
}
ent += header->length;
}
// kdebug("Global_System_Interrupt_Base=%d", io_apic_ICS->Global_System_Interrupt_Base);
apic_ioapic_map.addr_phys = io_apic_ICS->IO_APIC_Address;
apic_ioapic_map.virtual_index_addr = (unsigned char *)APIC_IO_APIC_VIRT_BASE_ADDR;
apic_ioapic_map.virtual_data_addr = (uint *)(APIC_IO_APIC_VIRT_BASE_ADDR + 0x10);
apic_ioapic_map.virtual_EOI_addr = (uint *)(APIC_IO_APIC_VIRT_BASE_ADDR + 0x40);
// kdebug("(ul)apic_ioapic_map.virtual_index_addr=%#018lx", (ul)apic_ioapic_map.virtual_index_addr);
// 填写页表，完成地址映射
mm_map_phys_addr((ul)apic_ioapic_map.virtual_index_addr, apic_ioapic_map.addr_phys, PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD, false);
// 设置IO APIC ID 为0x0f000000
*apic_ioapic_map.virtual_index_addr = 0x00;
io_mfence();
*apic_ioapic_map.virtual_data_addr = 0x0f000000;
io_mfence();
// kdebug("I/O APIC ID:%#010x", ((*apic_ioapic_map.virtual_data_addr) >> 24) & 0xff);
io_mfence();
// 获取IO APIC Version
*apic_ioapic_map.virtual_index_addr = 0x01;
io_mfence();
kdebug("IO APIC Version=%d, Max Redirection Entries=%d", *apic_ioapic_map.virtual_data_addr & 0xff, (((*apic_ioapic_map.virtual_data_addr) >> 16) & 0xff) + 1);
// 初始化RTE表项，将所有RTE表项屏蔽
for (int i = 0x10; i < 0x40; i += 2)
{
// 以0x20为起始中断向量号，初始化RTE
apic_ioapic_write_rte(i, 0x10020 + ((i - 0x10) >> 1));
}
// 不需要手动启动IO APIC，只要初始化了RTE寄存器之后，io apic就会自动启用了。
// 而且不是每台电脑都有RCBA寄存器，因此不需要手动启用IO APIC
}
/**
* @brief 初始化AP处理器的Local apic
*
*/
void apic_init_ap_core_local_apic()
{
kinfo("Initializing AP-core's local apic...");
uint eax, edx;
// 启用xAPIC 和x2APIC
uint64_t ia32_apic_base = rdmsr(0x1b);
ia32_apic_base |= (1 << 11);
if (flag_support_x2apic) // 如果支持x2apic，则启用
{
ia32_apic_base |= (1 << 10);
wrmsr(0x1b, ia32_apic_base);
}
ia32_apic_base = rdmsr(0x1b);
eax = ia32_apic_base & 0xffffffff;
// 检测是否成功启用xAPIC和x2APIC
if ((eax & 0xc00) == 0xc00)
kinfo("xAPIC & x2APIC enabled!");
else if ((eax & 0x800) == 0x800)
kinfo("Only xAPIC enabled!");
else
kerror("Both xAPIC and x2APIC are not enabled.");
// 设置SVR寄存器，开启local APIC、禁止EOI广播
if (flag_support_x2apic) // 当前为x2APIC
__local_apic_x2apic_init();
else // 当前为xapic
__local_apic_xapic_init();
}
/**
* @brief 当前使用xapic来初始化local apic
*
*/
static void __local_apic_xapic_init()
{
__apic_enable_state = APIC_XAPIC_ENABLED;
// 设置svr的 apic软件使能位
uint64_t qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR);
qword |= (1 << 8);
*(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR) = qword;
qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR);
if (qword & 0x100)
kinfo("APIC Software Enabled.");
if (qword & 0x1000)
kinfo("EOI-Broadcast Suppression Enabled.");
// 从 Local APIC Version register 获取Local APIC Version
qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_Version);
qword &= 0xffffffff;
local_apic_max_LVT_entries = ((qword >> 16) & 0xff) + 1;
local_apic_version = qword & 0xff;
kdebug("local APIC Version:%#010x,Max LVT Entry:%#010x,SVR(Suppress EOI Broadcast):%#04x\t", local_apic_version, local_apic_max_LVT_entries, (qword >> 24) & 0x1);
if ((qword & 0xff) < 0x10)
{
kdebug("82489DX discrete APIC");
}
else if (((qword & 0xff) >= 0x10) && ((qword & 0xff) <= 0x15))
kdebug("Integrated APIC.");
io_mfence();
// 如果写入这里的话，在有的机器上面会报错
// *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_CMCI) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_TIMER) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_THERMAL) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_PERFORMANCE_MONITOR) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_LINT0) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_LINT1) = APIC_LVT_INT_MASKED;
io_mfence();
*(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_ERROR) = APIC_LVT_INT_MASKED;
io_mfence();
kdebug("All LVT Masked");
}
/**
* @brief 当前使用x2apic来初始化local apic
*
*/
static void __local_apic_x2apic_init()
{
__apic_enable_state = APIC_X2APIC_ENABLED;
uint32_t eax, edx;
__asm__ __volatile__("movq $0x80f, %%rcx \n\t"
"rdmsr \n\t"
"bts $8, %%rax \n\t"
// "bts $12, %%rax \n\t"
"movq $0x80f, %%rcx \n\t"
"wrmsr \n\t"
"movq $0x80f , %%rcx \n\t"
"rdmsr \n\t"
: "=a"(eax), "=d"(edx)::"memory");
if (eax & 0x100)
kinfo("APIC Software Enabled.");
if (eax & 0x1000)
kinfo("EOI-Broadcast Suppression Enabled.");
// 获取Local APIC Version
// 0x803处是 Local APIC Version register
__asm__ __volatile__("movq $0x803, %%rcx \n\t"
"rdmsr \n\t"
: "=a"(eax), "=d"(edx)::"memory");
local_apic_max_LVT_entries = ((eax >> 16) & 0xff) + 1;
local_apic_version = eax & 0xff;
kdebug("local APIC Version:%#010x,Max LVT Entry:%#010x,SVR(Suppress EOI Broadcast):%#04x\t", local_apic_version, local_apic_max_LVT_entries, (eax >> 24) & 0x1);
if ((eax & 0xff) < 0x10)
kdebug("82489DX discrete APIC");
else if (((eax & 0xff) >= 0x10) && ((eax & 0xff) <= 0x15))
kdebug("Integrated APIC.");
// 由于尚未配置LVT对应的处理程序，因此先屏蔽所有的LVT
__asm__ __volatile__( // "movq $0x82f, %%rcx \n\t" // CMCI
// "wrmsr \n\t"
"movq $0x832, %%rcx \n\t" // Timer
"wrmsr \n\t"
"movq $0x833, %%rcx \n\t" // Thermal Monitor
"wrmsr \n\t"
"movq $0x834, %%rcx \n\t" // Performance Counter
"wrmsr \n\t"
"movq $0x835, %%rcx \n\t" // LINT0
"wrmsr \n\t"
"movq $0x836, %%rcx \n\t" // LINT1
"wrmsr \n\t"
"movq $0x837, %%rcx \n\t" // Error
"wrmsr \n\t"
:
: "a"(0x10000), "d"(0x00)
: "memory");
kdebug("All LVT Masked");
}
/**
* @brief 初始化local apic
*
*/
void apic_local_apic_init()
{
uint64_t ia32_apic_base = rdmsr(0x1b);
// kdebug("apic base=%#018lx", (ia32_apic_base & 0x1FFFFFFFFFF000));
// 映射Local APIC 寄存器地址
mm_map_phys_addr(APIC_LOCAL_APIC_VIRT_BASE_ADDR, (ia32_apic_base & 0x1FFFFFFFFFFFFF), PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD, false);
uint a, b, c, d;
cpu_cpuid(1, 0, &a, &b, &c, &d);
// kdebug("CPUID 0x01, eax:%#010lx, ebx:%#010lx, ecx:%#010lx, edx:%#010lx", a, b, c, d);
// 判断是否支持APIC和xAPIC
if ((1 << 9) & d)
{
flag_support_apic = true;
kdebug("This computer support APIC&xAPIC");
}
else
{
flag_support_apic = false;
kerror("This computer does not support APIC&xAPIC");
while (1)
;
}
// 判断是否支持x2APIC
if ((1 << 21) & c)
{
flag_support_x2apic = true;
kdebug("This computer support x2APIC");
}
else
{
flag_support_x2apic = false;
kwarn("This computer does not support x2APIC");
}
uint eax, edx;
// 启用xAPIC 和x2APIC
ia32_apic_base = rdmsr(0x1b);
ia32_apic_base |= (1 << 11);
if (flag_support_x2apic) // 如果支持x2apic，则启用
{
ia32_apic_base |= (1 << 10);
wrmsr(0x1b, ia32_apic_base);
}
ia32_apic_base = rdmsr(0x1b);
eax = ia32_apic_base & 0xffffffff;
// 检测是否成功启用xAPIC和x2APIC
if ((eax & 0xc00) == 0xc00)
kinfo("xAPIC & x2APIC enabled!");
else if ((eax & 0x800) == 0x800)
kinfo("Only xAPIC enabled!");
else
kerror("Both xAPIC and x2APIC are not enabled.");
// 设置SVR寄存器，开启local APIC、禁止EOI广播
if (flag_support_x2apic) // 当前为x2APIC
__local_apic_x2apic_init();
else // 当前为xapic
__local_apic_xapic_init();
// 获取Local APIC的基础信息 （参见英特尔开发手册Vol3A 10-39）
// Table 10-6. Local APIC Register Address Map Supported by x2APIC
// 获取 Local APIC ID
// 0x802处是x2APIC ID 位宽32bits 的 Local APIC ID register
/*
__asm__ __volatile__("movq $0x802, %%rcx \n\t"
"rdmsr \n\t"
: "=a"(eax), "=d"(edx)::"memory");
*/
// kdebug("get Local APIC ID: edx=%#010x, eax=%#010x", edx, eax);
// kdebug("local_apic_id=%#018lx", *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_ID));
}
/**
* @brief 初始化apic控制器
*
*/
void apic_init()
{
// 初始化中断门， 中断使用rsp0防止在软中断时发生嵌套，然后处理器重新加载导致数据被抹掉
for (int i = 32; i <= 55; ++i)
set_intr_gate(i, 0, interrupt_table[i - 32]);
// 设置local apic中断门
for (int i = 150; i < 160; ++i)
set_intr_gate(i, 0, local_apic_interrupt_table[i - 150]);
// 屏蔽类8259A芯片
io_out8(0x21, 0xff);
io_out8(0xa1, 0xff);
// 写入8259A pic的EOI位
io_out8(0x20, 0x20);
io_out8(0xa0, 0x20);
kdebug("8259A Masked.");
// enable IMCR
io_out8(0x22, 0x70);
io_out8(0x23, 0x01);
apic_local_apic_init();
apic_io_apic_init();
// get RCBA address
io_out32(0xcf8, 0x8000f8f0);
uint32_t RCBA_phys = io_in32(0xcfc);
// 获取RCBA寄存器的地址
if (RCBA_phys > 0xfec00000 && RCBA_phys < 0xfee00000)
RCBA_vaddr = SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE + RCBA_phys;
else
{
RCBA_vaddr = 0;
kwarn("Cannot get RCBA address. RCBA_phys=%#010lx", RCBA_phys);
}
sti();
}
/**
* @brief 中断服务程序
*
* @param rsp 中断栈指针
* @param number 中断向量号
*/
void do_IRQ(struct pt_regs *rsp, ul number)
{
if (number < 0x80 && number >= 32) // 以0x80为界限，低于0x80的是外部中断控制器，高于0x80的是Local APIC
{
// ==========外部中断控制器========
irq_desc_t *irq = &interrupt_desc[number - 32];
// 执行中断上半部处理程序
if (irq != NULL && irq->handler != NULL)
irq->handler(number, irq->parameter, rsp);
else
kwarn("Intr vector [%d] does not have a handler!");
// 向中断控制器发送应答消息
if (irq->controller != NULL && irq->controller->ack != NULL)
irq->controller->ack(number);
else
__send_eoi();
}
else if (number >= 200)
{
apic_local_apic_edge_ack(number);
{
irq_desc_t *irq = &SMP_IPI_desc[number - 200];
if (irq->handler != NULL)
irq->handler(number, irq->parameter, rsp);
}
}
else if (number >= 150 && number < 200)
{
irq_desc_t *irq = &local_apic_interrupt_desc[number - 150];
// 执行中断上半部处理程序
if (irq != NULL && irq->handler != NULL)
irq->handler(number, irq->parameter, rsp);
else
kwarn("Intr vector [%d] does not have a handler!");
// 向中断控制器发送应答消息
if (irq->controller != NULL && irq->controller->ack != NULL)
irq->controller->ack(number);
else
__send_eoi(); // 向EOI寄存器写入0x00表示结束中断
}
else
{
kwarn("do IRQ receive: %d", number);
// 忽略未知中断
return;
}
// kdebug("before softirq");
// 进入软中断处理程序
do_softirq();
// kdebug("after softirq");
// 检测当前进程是否持有自旋锁，若持有自旋锁，则不进行抢占式的进程调度
if (current_pcb->preempt_count > 0)
return;
else if (current_pcb->preempt_count < 0)
kBUG("current_pcb->preempt_count<0! pid=%d", current_pcb->pid); // should not be here
// 检测当前进程是否可被调度
if (current_pcb->flags & PF_NEED_SCHED)
{
io_mfence();
sched();
}
}
/**
* @brief 读取RTE寄存器
* 由于RTE位宽为64位而IO window寄存器只有32位，因此需要两次读取
* @param index 索引值
* @return ul
*/
ul apic_ioapic_read_rte(unsigned char index)
{
// 由于处理器的乱序执行的问题，需要加入内存屏障以保证结果的正确性。
ul ret;
// 先读取高32bit
*apic_ioapic_map.virtual_index_addr = index + 1;
io_mfence();
ret = *apic_ioapic_map.virtual_data_addr;
ret <<= 32;
io_mfence();
// 读取低32bit
*apic_ioapic_map.virtual_index_addr = index;
io_mfence();
ret |= *apic_ioapic_map.virtual_data_addr;
io_mfence();
return ret;
}
/**
* @brief 写入RTE寄存器
*
* @param index 索引值
* @param value 要写入的值
*/
void apic_ioapic_write_rte(unsigned char index, ul value)
{
// 先写入低32bit
*apic_ioapic_map.virtual_index_addr = index;
io_mfence();
*apic_ioapic_map.virtual_data_addr = value & 0xffffffff;
io_mfence();
// 再写入高32bit
value >>= 32;
io_mfence();
*apic_ioapic_map.virtual_index_addr = index + 1;
io_mfence();
*apic_ioapic_map.virtual_data_addr = value & 0xffffffff;
io_mfence();
}
// =========== 中断控制操作接口 ============
void apic_ioapic_enable(ul irq_num)
{
ul index = 0x10 + ((irq_num - 32) << 1);
ul value = apic_ioapic_read_rte(index);
value &= (~0x10000UL);
apic_ioapic_write_rte(index, value);
}
void apic_ioapic_disable(ul irq_num)
{
ul index = 0x10 + ((irq_num - 32) << 1);
ul value = apic_ioapic_read_rte(index);
value |= (0x10000UL);
apic_ioapic_write_rte(index, value);
}
ul apic_ioapic_install(ul irq_num, void *arg)
{
struct apic_IO_APIC_RTE_entry *entry = (struct apic_IO_APIC_RTE_entry *)arg;
// RTE表项值写入对应的RTE寄存器
apic_ioapic_write_rte(0x10 + ((irq_num - 32) << 1), *(ul *)entry);
return 0;
}
void apic_ioapic_uninstall(ul irq_num)
{
// 将对应的RTE表项设置为屏蔽状态
apic_ioapic_write_rte(0x10 + ((irq_num - 32) << 1), 0x10000UL);
}
void apic_ioapic_level_ack(ul irq_num) // 电平触发
{
__send_eoi();
*apic_ioapic_map.virtual_EOI_addr = irq_num;
}
void apic_ioapic_edge_ack(ul irq_num) // 边沿触发
{
// 向EOI寄存器写入0x00表示结束中断
/*
uint *eoi = (uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_EOI);
*eoi = 0x00;
*/
__send_eoi();
}
/**
* @brief local apic 边沿触发应答
*
* @param irq_num
*/
void apic_local_apic_edge_ack(ul irq_num)
{
// 向EOI寄存器写入0x00表示结束中断
__send_eoi();
}
/**
* @brief 读取指定类型的 Interrupt Control Structure
*
* @param type ics的类型
* @param ret_vaddr 对应的ICS的虚拟地址数组
* @param total 返回数组的元素总个数
* @return uint
*/
uint apic_get_ics(const uint type, ul ret_vaddr[], uint *total)
{
void *ent = (void *)(madt) + sizeof(struct acpi_Multiple_APIC_Description_Table_t);
struct apic_Interrupt_Controller_Structure_header_t *header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
bool flag = false;
uint cnt = 0;
while (header->length > 2)
{
header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
if (header->type == type)
{
ret_vaddr[cnt++] = (ul)ent;
flag = true;
}
ent += header->length;
}
*total = cnt;
if (!flag)
return APIC_E_NOTFOUND;
else
return APIC_SUCCESS;
}
/**
* @brief 构造RTE Entry结构体
*
* @param entry 返回的结构体
* @param vector 中断向量
* @param deliver_mode 投递模式
* @param dest_mode 目标模式
* @param deliver_status 投递状态
* @param polarity 电平触发极性
* @param irr 远程IRR标志位（只读）
* @param trigger 触发模式
* @param mask 屏蔽标志位，（0为未屏蔽， 1为已屏蔽）
* @param dest_apicID 目标apicID
*/
void apic_make_rte_entry(struct apic_IO_APIC_RTE_entry *entry, uint8_t vector, uint8_t deliver_mode, uint8_t dest_mode,
uint8_t deliver_status, uint8_t polarity, uint8_t irr, uint8_t trigger, uint8_t mask, uint8_t dest_apicID)
{
entry->vector = vector;
entry->deliver_mode = deliver_mode;
entry->dest_mode = dest_mode;
entry->deliver_status = deliver_status;
entry->polarity = polarity;
entry->remote_IRR = irr;
entry->trigger_mode = trigger;
entry->mask = mask;
entry->reserved = 0;
if (dest_mode == DEST_PHYSICAL)
{
entry->destination.physical.phy_dest = dest_apicID;
entry->destination.physical.reserved1 = 0;
entry->destination.physical.reserved2 = 0;
}
else
{
entry->destination.logical.logical_dest = dest_apicID;
entry->destination.logical.reserved1 = 0;
}
}
#pragma GCC pop_options