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	Commit message (Collapse)	Author	Age	Files	Lines
*	Fix interrupt handling	Damien Zammit	2023-10-03	1	-2/+14
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Logic for interrupts: - interrupt.S raises spl (thus IF cleared) - interrupt.S EOI - interrupt.S calls the handler - for pure in-kernel handlers, they do whatever they want with IF cleared. - when a userland handler is registers, queue_intr masks the irq. - interrupt.S lowers spl with splx_cli, thus IF still cleared - iret, that sets IF - later on, userland acks the IRQ, that unmasks the irq The key to this change is that all interrupts, including IPIs, are treated the same way. Eg. the spl level is now raised before an IPI and restored after. Also, EOI is not needed inside irq_acknowledge. With this change and the experimental change not to dispatch threads direct to idle processors in the scheduler, I no longer observe kernel faults, but an occasional hang does occur. Message-Id: <20231002033906.124427-1-damien@zamaudio.com>
*	intr: Fix crash on irq notification port destruction	Samuel Thibault	2023-06-12	1	-1/+8
\| \| \| \| \|	When the Linux IRQ driver is used we don't really control the list, so we end up with a small leak.
*	intr: Simplify clearing after intr port deallocation	Samuel Thibault	2023-02-16	1	-35/+21
\| \| \| \| \|	This notably avoids calling ipc_port_release from the interrupt handler, which was completely unsafe.
*	device intr: Return an error on bogus intr port	Samuel Thibault	2022-03-13	1	-3/+5
\| \| \| \|	Rather than risking dereferencing NULL.
*	device intr: Fix hypothetical NULL dererefence	Samuel Thibault	2022-03-13	1	-1/+1
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*	SMP: Fix warnings	Samuel Thibault	2021-04-04	1	-2/+2
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*	intr: Always share irqs	Samuel Thibault	2021-03-31	1	-0/+2
\| \| \| \| \| \|	We currently already always assume that irqs user handlers can be shared * device/intr.c (install_user_intr_handler): Add SA_SHIRQ to flags.
*	intr: Add user interrupt handling code for non-Linux case	Damien Zammit	2021-03-31	1	-0/+80
\| \| \| \| \| \| \| \| \| \|	* device/intr.c: Include <kern/assert.h> (struct intr_list): New structure. (user_intr_handlers): New array. (user_irq_handler): New function. (install_user_intr_handler): New function. Message-Id: <20210330025830.63528-2-damien@zamaudio.com>
*	Add hardware interrupt notification mechanism	Samuel Thibault	2020-07-10	1	-0/+283
	This allows privileged userland drivers to get notifications of hardware interrupts. Initial work by Zheng Da, reworked by Damien Zammit and myself. * Makefrag.am (libkernel_a_SOURCES): Add device/intr.c and device/intr.h. (include_device_HEADERS): Add include/device/notify.defs and include/device/notify.h. * device/dev_hdr.h (name_equal): Add declaration. * device/ds_routines.c: Include <device/intr.h> (ds_device_intr_register, ds_device_intr_ack): New functions. * device/intr.c, device/intr.h: New files. * doc/mach.texi (Device Interrupt): New section. * i386/Makefrag.am (libkernel_a_SOURCES): Add i386/i386/irq.c and i386/i386/irq.h. * i386/i386/irq.c, i386/i386/irq.h: New files. * i386/i386at/conf.c: Include <device/intr.h>. (irqname): New macro. (dev_name_list): Add irq device. * include/device/device.defs (device_intr_register, device_intr_ack): New RPCs. * include/device/notify.defs, include/device/notify.h: New files. * kern/startup.c: Include <device/intr.h> (start_kernel_threads): Start intr_thread thread. * linux/dev/arch/i386/kernel/irq.c: Include <device/intr.h> (linux_action): Add user_intr field. (linux_intr): Call user_intr action if any. (mask_irq, unmask_irq): Move functions to i386/i386/pic.c (__disable_irq, __enable_irq): Move functions to i386/i386/irq.c. (install_user_intr_handler): New function. (request_irq): Initialize user_intr field. * linux/src/include/asm-i386/irq.h (__disable_irq, __enable_irq): Remove prototypes. * i386/i386/pic.c (mask_irq, unmask_irq): New functions. * i386/i386/pic.h (mask_irq, unmask_irq): New prototypes.