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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* ISH minute-IA CPU initialization
*/
#include "config.h"
#include "interrupts.h"
#include "ia_structs.h"
.equ CR0_NW, (1 << 29)
.equ CR0_CD, (1 << 30)
.global __idt
.global __gdt
.global __gdt_ptr
# GDT is loaded by ISH ROM. The FW code retains the same GDT
# and hence the same segment selector
.set code_seg, 0x8
.section .data.vecttable
# Macro that defines an interrupt descriptor
.macro interrupt_descriptor
.word def_irq_low # low 16 bits of default_int_handler
.word code_seg
.byte 0
.byte IDT_DESC_FLAGS
.word def_irq_high # high 16 bits of default_int_handler
.endm
.align 32
# Static Interrupt descriptor table (vectors 0-255), all vectors initialized
# to default_int_handler. DECLARE_IRQ() remaps to the appropriate handler.
__idt:
interrupt_descriptor # 0 - Divide error
interrupt_descriptor # 1 - Debug
interrupt_descriptor # 2 - NMI interrupt
interrupt_descriptor # 3 - Breakpoint
interrupt_descriptor # 4 - Overflow
interrupt_descriptor # 5 - Bound range exceeded
interrupt_descriptor # 6 - Invalid opcode
interrupt_descriptor # 7 - Device not available
interrupt_descriptor # 8 - Double fault
interrupt_descriptor # 9 - Coprocessor overrun
interrupt_descriptor # 10 - Invalid TSS
interrupt_descriptor # 11 - Segment not present
interrupt_descriptor # 12 - Stack segment fault
interrupt_descriptor # 13 - General protection
interrupt_descriptor # 14 - Page fault
interrupt_descriptor # 15 - Reserved
interrupt_descriptor # 16 - Floating point error
interrupt_descriptor # 17 - Alignment check
interrupt_descriptor # 18 - Machine check
interrupt_descriptor # 19 - SIMD floating-point exception
interrupt_descriptor # 20 - Virtualization exception
interrupt_descriptor # 21..31 - Reserved
interrupt_descriptor
interrupt_descriptor
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interrupt_descriptor # 32..255 - User-defined, Maskable Interrupts
interrupt_descriptor
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interrupt_descriptor # 64
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interrupt_descriptor # 96
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interrupt_descriptor # 128
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interrupt_descriptor # 160
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interrupt_descriptor # 192
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interrupt_descriptor # 224
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interrupt_descriptor # 255
__gdt:
# Entry 0: Null descriptor
.long 0x0
.long 0x0
# Entry 1: Code descriptor
# Base: 0x0
# Limit: 0xffffffff
# Flags: 0x9b (Code E/R, Present, DPL0, Acessed=1)
.long GEN_GDT_DESC_LO(0x0, 0xffffffff, GDT_DESC_CODE_FLAGS)
.long GEN_GDT_DESC_UP(0x0, 0xffffffff, GDT_DESC_CODE_FLAGS)
# Entry 2: Data descriptor
# Base: 0x0
# Limit: 0xffffffff
# Flags: 0x93 (Data R/W, Present, DPL0, Acessed=1)
.long GEN_GDT_DESC_LO(0x0, 0xffffffff, GDT_DESC_DATA_FLAGS)
.long GEN_GDT_DESC_UP(0x0, 0xffffffff, GDT_DESC_DATA_FLAGS)
#if defined(CONFIG_ISH_PM_AONTASK)
# placeholder entries, will be updated by init_aon_task()
# in power_mgt.c
# Entry 3: placeholder TSS descriptor for main FW
.long 0x0
.long 0x0
# Entry 4: placeholder TSS descriptor for aontask
.long 0x0
.long 0x0
# Entry 5: placeholder LDT descriptor for aontask
.long 0x0
.long 0x0
#endif
#.section .data
__idt_ptr:
.word 2047 # Table size in bytes, count from 0
# (8N - 1). N = 256 - the number of vectors
.long __idt # Base address of IDT
__gdt_ptr:
.word 24
.long __gdt
.section .init
.code32
# The .init section is mapped to linear address 0xFF000000, the SRAM start.
# ISH BUP (bring-up) downloads ISH FW to ISH SRAM and jumps to start address.
.global reset
# Entry point - core is already set to 32-bit linear mode by ISH ROM
reset:
# Disabling interrupts initially. It will be enabled when tasks start
cli
# Clear .bss section.
xorl %eax, %eax
cld
movl $__bss_start, %edi
movl $__bss_size_words, %ecx
rep stosl
# System stack is within .bss, already cleared
movl $stack_end, %esp
# Load GDT
lgdt __gdt_ptr
# Load IDT
lidt __idt_ptr
# Enable cache (CR0)
movl %cr0, %eax
andl $~(CR0_CD | CR0_NW), %eax
movl %eax, %cr0
# Reset Task-Switched flag to prevent an ESC instruction such
# as fninit, from triggering a Device-not-available fault
clts
#ifdef CONFIG_FPU
fninit
#endif
# Jump to C code
jmp main
# Reserve space for system stack
.section .bss.system_stack
stack_start:
.space CONFIG_STACK_SIZE, 0
stack_end:
.global stack_end
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