sys-gic.c File Reference

#include <io.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <types.h>
#include <log.h>
#include <mmu.h>
#include <reg-ncat.h>
#include <sys-gic.h>

Include dependency graph for sys-gic.c:

Functions
static int	interrupts_is_open (void)
	Get interrupts state.
static void	gic_spi_set_target (int irq_no, int cpu_id)
	Set the target CPU for a specific SPI interrupt.
static void	gic_distributor_init (void)
	Initialize the GIC distributor controller.
static void	gic_cpuif_init (void)
static void	default_isr (void *data)
static void	gic_sgi_handler (uint32_t irq_no)
static void	gic_ppi_handler (uint32_t irq_no)
static void	gic_spi_handler (uint32_t irq_no)
static void	gic_clear_pending (uint32_t irq_no)
	Clears the pending status of the specified IRQ in the GIC.
int	arch_interrupt_init (void)
	Initializes the interrupt mechanism.
int	arch_interrupt_exit (void)
	Exits the interrupt mechanism.
int	sunxi_gic_cpu_interface_init (int cpu)
	Initializes the Sunxi GIC CPU interface.
int	sunxi_gic_cpu_interface_exit (void)
	Exits the Sunxi GIC CPU interface.
void	do_irq (struct arm_regs_t *regs)
	Handles the IRQ with ARM registers.
void	irq_free_handler (int irq)
	Frees the resources associated with the specified IRQ handler.
int	irq_enable (int irq_no)
	Enables the specified IRQ.
int	irq_disable (int irq_no)
	Disables the specified IRQ.
void	irq_install_handler (int irq, interrupt_handler_t handle_irq, void *data)
	Installs a handler for the specified IRQ.

Variables
static irq_handler_t	sunxi_int_handlers [GIC_IRQ_NUM]

Function Documentation

arch_interrupt_exit()

int arch_interrupt_exit

(

void

)

Exits the interrupt mechanism.

Returns

0 on success, or an error code

arch_interrupt_init()

int arch_interrupt_init

(

void

)

Initializes the interrupt mechanism.

Returns

0 on success, or an error code

default_isr()

static void default_isr ( void *  data )

static

do_irq()

void do_irq

(

struct arm_regs_t *

regs

)

Handles the IRQ with ARM registers.

Parameters

regs	Pointer to the ARM registers

gic_clear_pending()

static void gic_clear_pending ( uint32_t  irq_no )

static

Clears the pending status of the specified IRQ in the GIC.

Parameters

irq_no

IRQ number to clear pending status

gic_cpuif_init()

static void gic_cpuif_init ( void  )

static

gic_distributor_init()

static void gic_distributor_init ( void  )

static

Initialize the GIC distributor controller.

Parameters

void

Returns

void

gic_ppi_handler()

static void gic_ppi_handler ( uint32_t  irq_no )

static

gic_sgi_handler()

static void gic_sgi_handler ( uint32_t  irq_no )

static

gic_spi_handler()

static void gic_spi_handler ( uint32_t  irq_no )

static

gic_spi_set_target()

static void gic_spi_set_target ( int  irq_no, int  cpu_id  )

inlinestatic

Set the target CPU for a specific SPI interrupt.

This inline function sets the target CPU for a specific SPI interrupt. It calculates the address of the target register based on the interrupt number, reads the current value of the register, modifies it to set the target CPU, and writes the modified value back to the register. The function assumes that the interrupt number is offset by 32 and that the maximum CPU ID is 15.

Parameters

irq_no	The interrupt number.
cpu_id	The CPU ID of the target CPU.

interrupts_is_open()

static int interrupts_is_open ( void  )

inlinestatic

Get interrupts state.

This inline function checks the state of interrupts. It reads the value of the CPSR register using assembly instructions and returns 1 if interrupts are open (CPSR bit 7 is cleared), otherwise it returns 0.

Returns

int Returns 1 if interrupts are open, otherwise returns 0.

irq_disable()

int irq_disable

(

int

irq_no

)

Disables the specified IRQ.

Parameters

irq_no

IRQ number to be disabled

Returns

0 on success, or an error code

irq_enable()

int irq_enable

(

int

irq_no

)

Enables the specified IRQ.

Parameters

irq_no

IRQ number to be enabled

Returns

0 on success, or an error code

irq_free_handler()

void irq_free_handler

(

int

irq

)

Frees the resources associated with the specified IRQ handler.

Parameters

irq	IRQ number

irq_install_handler()

void irq_install_handler	(	int	irq,
		interrupt_handler_t	handle_irq,
		void *	data
	)

Installs a handler for the specified IRQ.

Parameters

irq	IRQ number
handle_irq	Function pointer to the interrupt handler function
data	Pointer to data associated with the interrupt handler

sunxi_gic_cpu_interface_exit()

int sunxi_gic_cpu_interface_exit

(

void

)

Exits the Sunxi GIC CPU interface.

Returns

0 on success, or an error code

sunxi_gic_cpu_interface_init()

int sunxi_gic_cpu_interface_init

(

int

cpu

)

Initializes the Sunxi GIC CPU interface.

Parameters

cpu	CPU identifier

Returns

0 on success, or an error code

Variable Documentation

sunxi_int_handlers

irq_handler_t sunxi_int_handlers[GIC_IRQ_NUM]

static