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nes-proj/cpu/x86/helpers.h

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x86: Add helpers.h This patch adds the helpers.h. This file should contain only x86-related helper functions and macros. For now, we define the BIT macro and halt() helpers which will be used in upcoming patches. Additionally, this patch also changes loader.S to call the halt().
2015-04-13 17:07:59 +00:00
/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HELPERS_H
#define HELPERS_H
x86: Initialize the 8259 PIC The Programmable Interrupt Controller is a chip responsible for translating hardware interrupts to system interrupts. When it receives an Interrupt Request (IRQ), it triggers the appropriate interrupt line reaching the appropriate IDT gate, following a previously setup offset. There are 2 daisy-chained PICs. PIC1 handles IRQs 0-7 and PIC2 handles IRQs 8-15. If no vector offset is set, an IRQ0, for instance, would trigger the interrupt 0, clashing with the "Division by zero exception" handler. Thus the IRQs must be remapped. This patch implements the PICs initialization through their 4 Initialization Command Words (ICWs) in a very "canonical" way: - ICW1: the initializing command; - ICW2: the vector offset for the PIC1 and PIC2 (we add an offset of 32 positions); - ICW3: the inter-PICs wiring setup (we connect PIC2 to PIC1's IRQ2); - ICW4: extra systems information (we set PIC1 as Master and PIC2 as slave). It then masks the Interrupt Mask Register, blocking all IRQs but #2 initially. These must be unmasked on demand. The IMR is 8-bits long, so setting the n^th bit to 1 would DISABLE the IRQ n while setting it to 0 would ENABLE IRQ n. As stated, this is an implementation of the legacy 8259 PIC. More investigation is needed so we decide if it is enough or if we need the (newer) APIC implementation instead. This patch also adds the outb() helper function to helpers.h. The helpers is a wrapper for assembly 'out' instruction. Finally, since we now properly support hardware interrupts, this patch also enables IRQs in platform main(). More information: - Quark X1000 Datasheet, section 21.12, page 898. - http://wiki.osdev.org/8259_PIC - http://stanislavs.org/helppc/8259.html
2015-04-08 20:18:27 +00:00
#include <stdint.h>
x86: Add helpers.h This patch adds the helpers.h. This file should contain only x86-related helper functions and macros. For now, we define the BIT macro and halt() helpers which will be used in upcoming patches. Additionally, this patch also changes loader.S to call the halt().
2015-04-13 17:07:59 +00:00
#define BIT(n) (1UL << (n))
void halt(void) __attribute__((__noreturn__));
x86: Add PCI support This patch adds the pci.c and pci.h files, which support access to PCI configuration registers through a function interface. It defines the PCI configuration register access I/O port addresses and the pci_config_addr union and structure to assist in specifying addresses of PCI configuration registers. It also defines the PCI configuration register identifier for PCI BAR0. This patch also adds wrappers for 32-bit 'in' and 'out' port I/O instructions. They were placed in helpers.S, since they may be useful to other modules besides just the PCI support module.
2015-07-03 07:27:11 +00:00
/** Wrappers for the assembly 'out' instruction. */
void outb(uint16_t port, uint8_t val);
void outl(uint16_t port, uint32_t val);
x86: Initialize the 8259 PIC The Programmable Interrupt Controller is a chip responsible for translating hardware interrupts to system interrupts. When it receives an Interrupt Request (IRQ), it triggers the appropriate interrupt line reaching the appropriate IDT gate, following a previously setup offset. There are 2 daisy-chained PICs. PIC1 handles IRQs 0-7 and PIC2 handles IRQs 8-15. If no vector offset is set, an IRQ0, for instance, would trigger the interrupt 0, clashing with the "Division by zero exception" handler. Thus the IRQs must be remapped. This patch implements the PICs initialization through their 4 Initialization Command Words (ICWs) in a very "canonical" way: - ICW1: the initializing command; - ICW2: the vector offset for the PIC1 and PIC2 (we add an offset of 32 positions); - ICW3: the inter-PICs wiring setup (we connect PIC2 to PIC1's IRQ2); - ICW4: extra systems information (we set PIC1 as Master and PIC2 as slave). It then masks the Interrupt Mask Register, blocking all IRQs but #2 initially. These must be unmasked on demand. The IMR is 8-bits long, so setting the n^th bit to 1 would DISABLE the IRQ n while setting it to 0 would ENABLE IRQ n. As stated, this is an implementation of the legacy 8259 PIC. More investigation is needed so we decide if it is enough or if we need the (newer) APIC implementation instead. This patch also adds the outb() helper function to helpers.h. The helpers is a wrapper for assembly 'out' instruction. Finally, since we now properly support hardware interrupts, this patch also enables IRQs in platform main(). More information: - Quark X1000 Datasheet, section 21.12, page 898. - http://wiki.osdev.org/8259_PIC - http://stanislavs.org/helppc/8259.html
2015-04-08 20:18:27 +00:00
x86: Add PCI support This patch adds the pci.c and pci.h files, which support access to PCI configuration registers through a function interface. It defines the PCI configuration register access I/O port addresses and the pci_config_addr union and structure to assist in specifying addresses of PCI configuration registers. It also defines the PCI configuration register identifier for PCI BAR0. This patch also adds wrappers for 32-bit 'in' and 'out' port I/O instructions. They were placed in helpers.S, since they may be useful to other modules besides just the PCI support module.
2015-07-03 07:27:11 +00:00
/** Wrappers for the assembly 'in' instruction */
x86: Add Real-Time Clock Driver This patch adds a driver for Real-Time Clock (RTC). The RTC timer is suitable to implement some operating system features such as the system clock. Actually, the RTC will be used to implement the system clock in galileo platform. The driver introduced by this patch programs the RTC to generate interrupt periodically. The interrupt frequency can be configured by the user. On each RTC interrupt, a callback configured by the user is called. As expected, that callback is executed in interrupt context so the user should be aware of what it is not supposed to do (e.g. to call blocking functions). This patch also adds the inb() helper function to helpers.h. The helpers is a wrapper for assembly 'in' instruction.
2015-07-02 20:29:02 +00:00
uint8_t inb(uint16_t port);
x86: Add PCI support This patch adds the pci.c and pci.h files, which support access to PCI configuration registers through a function interface. It defines the PCI configuration register access I/O port addresses and the pci_config_addr union and structure to assist in specifying addresses of PCI configuration registers. It also defines the PCI configuration register identifier for PCI BAR0. This patch also adds wrappers for 32-bit 'in' and 'out' port I/O instructions. They were placed in helpers.S, since they may be useful to other modules besides just the PCI support module.
2015-07-03 07:27:11 +00:00
uint32_t inl(uint16_t port);
x86: Add Real-Time Clock Driver This patch adds a driver for Real-Time Clock (RTC). The RTC timer is suitable to implement some operating system features such as the system clock. Actually, the RTC will be used to implement the system clock in galileo platform. The driver introduced by this patch programs the RTC to generate interrupt periodically. The interrupt frequency can be configured by the user. On each RTC interrupt, a callback configured by the user is called. As expected, that callback is executed in interrupt context so the user should be aware of what it is not supposed to do (e.g. to call blocking functions). This patch also adds the inb() helper function to helpers.h. The helpers is a wrapper for assembly 'in' instruction.
2015-07-02 20:29:02 +00:00
x86: Add helpers.h This patch adds the helpers.h. This file should contain only x86-related helper functions and macros. For now, we define the BIT macro and halt() helpers which will be used in upcoming patches. Additionally, this patch also changes loader.S to call the halt().
2015-04-13 17:07:59 +00:00
#endif /* HELPERS_H */
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