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  → /branches/rcu/kernel/generic/src/ddi/ @ 2130

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Ignore whitespace Rev 2130 → Rev 2131

/branches/rcu/kernel/generic/src/ddi/irq.c
0,0 → 1,379
/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup genericddi
* @{
*/
/**
* @file
* @brief IRQ dispatcher.
*
* This file provides means of connecting IRQs with particular
* devices and logic for dispatching interrupts to IRQ handlers
* defined by those devices.
*
* This code is designed to support:
* - multiple devices sharing single IRQ
* - multiple IRQs per signle device
*
*
* Note about architectures.
*
* Some architectures has the term IRQ well defined. Examples
* of such architectures include amd64, ia32 and mips32. Some
* other architectures, such as sparc64, don't use the term
* at all. In those cases, we boldly step forward and define what
* an IRQ is.
*
* The implementation is generic enough and still allows the
* architectures to use the hardware layout effectively.
* For instance, on amd64 and ia32, where there is only 16
* IRQs, the irq_hash_table can be optimized to a one-dimensional
* array. Next, when it is known that the IRQ numbers (aka INR's)
* are unique, the claim functions can always return IRQ_ACCEPT.
*
*
* Note about the irq_hash_table.
*
* The hash table is configured to use two keys: inr and devno.
* However, the hash index is computed only from inr. Moreover,
* if devno is -1, the match is based on the return value of
* the claim() function instead of on devno.
*/
#include <ddi/irq.h>
#include <adt/hash_table.h>
#include <arch/types.h>
#include <synch/spinlock.h>
#include <arch.h>
#define KEY_INR 0
#define KEY_DEVNO 1
/**
* Spinlock protecting the hash table.
* This lock must be taken only when interrupts are disabled.
*/
SPINLOCK_INITIALIZE(irq_hash_table_lock);
static hash_table_t irq_hash_table;
/**
* Hash table operations for cases when we know that
* there will be collisions between different keys.
*/
static index_t irq_ht_hash(unative_t *key);
static bool irq_ht_compare(unative_t *key, count_t keys, link_t *item);
static hash_table_operations_t irq_ht_ops = {
.hash = irq_ht_hash,
.compare = irq_ht_compare,
.remove_callback = NULL /* not used */
};
/**
* Hash table operations for cases when we know that
* there will be no collisions between different keys.
* However, there might be still collisions among
* elements with single key (sharing of one IRQ).
*/
static index_t irq_lin_hash(unative_t *key);
static bool irq_lin_compare(unative_t *key, count_t keys, link_t *item);
static hash_table_operations_t irq_lin_ops = {
.hash = irq_lin_hash,
.compare = irq_lin_compare,
.remove_callback = NULL /* not used */
};
/** Initialize IRQ subsystem.
*
* @param inrs Numbers of unique IRQ numbers or INRs.
* @param chains Number of chains in the hash table.
*/
void irq_init(count_t inrs, count_t chains)
{
/*
* Be smart about the choice of the hash table operations.
* In cases in which inrs equals the requested number of
* chains (i.e. where there is no collision between
* different keys), we can use optimized set of operations.
*/
if (inrs == chains)
hash_table_create(&irq_hash_table, chains, 2, &irq_lin_ops);
else
hash_table_create(&irq_hash_table, chains, 2, &irq_ht_ops);
}
/** Initialize one IRQ structure.
*
* @param irq Pointer to the IRQ structure to be initialized.
*
*/
void irq_initialize(irq_t *irq)
{
link_initialize(&irq->link);
spinlock_initialize(&irq->lock, "irq.lock");
irq->inr = -1;
irq->devno = -1;
irq->trigger = (irq_trigger_t) 0;
irq->claim = NULL;
irq->handler = NULL;
irq->arg = NULL;
irq->notif_cfg.notify = false;
irq->notif_cfg.answerbox = NULL;
irq->notif_cfg.code = NULL;
irq->notif_cfg.method = 0;
irq->notif_cfg.counter = 0;
link_initialize(&irq->notif_cfg.link);
}
/** Register IRQ for device.
*
* The irq structure must be filled with information
* about the interrupt source and with the claim()
* function pointer and irq_handler() function pointer.
*
* @param irq IRQ structure belonging to a device.
*/
void irq_register(irq_t *irq)
{
ipl_t ipl;
unative_t key[] = {
(unative_t) irq->inr,
(unative_t) irq->devno
};
ipl = interrupts_disable();
spinlock_lock(&irq_hash_table_lock);
hash_table_insert(&irq_hash_table, key, &irq->link);
spinlock_unlock(&irq_hash_table_lock);
interrupts_restore(ipl);
}
/** Dispatch the IRQ.
*
* We assume this function is only called from interrupt
* context (i.e. that interrupts are disabled prior to
* this call).
*
* This function attempts to lookup a fitting IRQ
* structure. In case of success, return with interrupts
* disabled and holding the respective structure.
*
* @param inr Interrupt number (aka inr or irq).
*
* @return IRQ structure of the respective device or NULL.
*/
irq_t *irq_dispatch_and_lock(inr_t inr)
{
link_t *lnk;
unative_t key[] = {
(unative_t) inr,
(unative_t) -1 /* search will use claim() instead of devno */
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, key);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Find the IRQ structure corresponding to inr and devno.
*
* This functions attempts to lookup the IRQ structure
* corresponding to its arguments. On success, this
* function returns with interrups disabled, holding
* the lock of the respective IRQ structure.
*
* This function assumes interrupts are already disabled.
*
* @param inr INR being looked up.
* @param devno Devno being looked up.
*
* @return Locked IRQ structure on success or NULL on failure.
*/
irq_t *irq_find_and_lock(inr_t inr, devno_t devno)
{
link_t *lnk;
unative_t keys[] = {
(unative_t) inr,
(unative_t) devno
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, keys);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* can be collisions between different
* INRs.
*
* The devno is not used to compute the hash.
*
* @param key The first of the keys is inr and the second is devno or -1.
*
* @return Index into the hash table.
*/
index_t irq_ht_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr % irq_hash_table.entries;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the more complex architecture setup
* in which there are way too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match must be done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_ht_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = hash_table_get_instance(item, irq_t, link);
inr_t inr = (inr_t) key[KEY_INR];
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock(). */
rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
} else {
/* Invoked by irq_find_and_lock(). */
rv = ((irq->inr == inr) && (irq->devno == devno));
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* are no collisions between different
* INRs.
*
* @param key The first of the keys is inr and the second is devno or -1.
*
* @return Index into the hash table.
*/
index_t irq_lin_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the less complex architecture setup
* in which there are not too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match is not done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_lin_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = list_get_instance(item, irq_t, link);
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock() */
rv = (irq->claim() == IRQ_ACCEPT);
} else {
/* Invoked by irq_find_and_lock() */
rv = (irq->devno == devno);
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** @}
*/

/branches/rcu/kernel/generic/src/ddi/ddi.c
0,0 → 1,284
/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup genericddi
* @{
*/
/**
* @file
* @brief Device Driver Interface functions.
*
* This file contains functions that comprise the Device Driver Interface.
* These are the functions for mapping physical memory and enabling I/O
* space to tasks.
*/
#include <ddi/ddi.h>
#include <ddi/ddi_arg.h>
#include <proc/task.h>
#include <security/cap.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <synch/spinlock.h>
#include <syscall/copy.h>
#include <adt/btree.h>
#include <arch.h>
#include <align.h>
#include <errno.h>
/** This lock protects the parea_btree. */
SPINLOCK_INITIALIZE(parea_lock);
/** B+tree with enabled physical memory areas. */
static btree_t parea_btree;
/** Initialize DDI. */
void ddi_init(void)
{
btree_create(&parea_btree);
}
/** Enable piece of physical memory for mapping by physmem_map().
*
* @param parea Pointer to physical area structure.
*
* @todo This function doesn't check for overlaps. It depends on the kernel to
* create disjunct physical memory areas.
*/
void ddi_parea_register(parea_t *parea)
{
ipl_t ipl;
ipl = interrupts_disable();
spinlock_lock(&parea_lock);
/*
* TODO: we should really check for overlaps here.
* However, we should be safe because the kernel is pretty sane and
* memory of different devices doesn't overlap.
*/
btree_insert(&parea_btree, (btree_key_t) parea->pbase, parea, NULL);
spinlock_unlock(&parea_lock);
interrupts_restore(ipl);
}
/** Map piece of physical memory into virtual address space of current task.
*
* @param pf Physical address of the starting frame.
* @param vp Virtual address of the starting page.
* @param pages Number of pages to map.
* @param flags Address space area flags for the mapping.
*
* @return 0 on success, EPERM if the caller lacks capabilities to use this
* syscall, ENOENT if there is no task matching the specified ID or the
* physical address space is not enabled for mapping and ENOMEM if there
* was a problem in creating address space area. ENOTSUP is returned when
* an attempt to create an illegal address alias is detected.
*/
static int ddi_physmem_map(uintptr_t pf, uintptr_t vp, count_t pages, int flags)
{
ipl_t ipl;
cap_t caps;
mem_backend_data_t backend_data;
backend_data.base = pf;
backend_data.frames = pages;
/*
* Make sure the caller is authorised to make this syscall.
*/
caps = cap_get(TASK);
if (!(caps & CAP_MEM_MANAGER))
return EPERM;
ipl = interrupts_disable();
/*
* Check if the physical memory area is enabled for mapping.
* If the architecture supports virtually indexed caches, intercept
* attempts to create an illegal address alias.
*/
spinlock_lock(&parea_lock);
parea_t *parea;
btree_node_t *nodep;
parea = (parea_t *) btree_search(&parea_btree, (btree_key_t) pf, &nodep);
if (!parea || parea->frames < pages || ((flags & AS_AREA_CACHEABLE) &&
!parea->cacheable) || (!(flags & AS_AREA_CACHEABLE) &&
parea->cacheable)) {
/*
* This physical memory area cannot be mapped.
*/
spinlock_unlock(&parea_lock);
interrupts_restore(ipl);
return ENOENT;
}
#ifdef CONFIG_VIRT_IDX_DCACHE
if (PAGE_COLOR(parea->vbase) != PAGE_COLOR(vp)) {
/*
* Refuse to create an illegal address alias.
*/
spinlock_unlock(&parea_lock);
interrupts_restore(ipl);
return ENOTSUP;
}
#endif /* CONFIG_VIRT_IDX_DCACHE */
spinlock_unlock(&parea_lock);
spinlock_lock(&TASK->lock);
if (!as_area_create(TASK->as, flags, pages * PAGE_SIZE, vp, AS_AREA_ATTR_NONE,
&phys_backend, &backend_data)) {
/*
* The address space area could not have been created.
* We report it using ENOMEM.
*/
spinlock_unlock(&TASK->lock);
interrupts_restore(ipl);
return ENOMEM;
}
/*
* Mapping is created on-demand during page fault.
*/
spinlock_unlock(&TASK->lock);
interrupts_restore(ipl);
return 0;
}
/** Enable range of I/O space for task.
*
* @param id Task ID of the destination task.
* @param ioaddr Starting I/O address.
* @param size Size of the enabled I/O space..
*
* @return 0 on success, EPERM if the caller lacks capabilities to use this
* syscall, ENOENT if there is no task matching the specified ID.
*/
static int ddi_iospace_enable(task_id_t id, uintptr_t ioaddr, size_t size)
{
ipl_t ipl;
cap_t caps;
task_t *t;
int rc;
/*
* Make sure the caller is authorised to make this syscall.
*/
caps = cap_get(TASK);
if (!(caps & CAP_IO_MANAGER))
return EPERM;
ipl = interrupts_disable();
spinlock_lock(&tasks_lock);
t = task_find_by_id(id);
if ((!t) || (!context_check(CONTEXT, t->context))) {
/*
* There is no task with the specified ID
* or the task belongs to a different security
* context.
*/
spinlock_unlock(&tasks_lock);
interrupts_restore(ipl);
return ENOENT;
}
/* Lock the task and release the lock protecting tasks_btree. */
spinlock_lock(&t->lock);
spinlock_unlock(&tasks_lock);
rc = ddi_iospace_enable_arch(t, ioaddr, size);
spinlock_unlock(&t->lock);
interrupts_restore(ipl);
return rc;
}
/** Wrapper for SYS_PHYSMEM_MAP syscall.
*
* @param phys_base Physical base address to map
* @param virt_base Destination virtual address
* @param pages Number of pages
* @param flags Flags of newly mapped pages
*
* @return 0 on success, otherwise it returns error code found in errno.h
*/
unative_t sys_physmem_map(unative_t phys_base, unative_t virt_base,
unative_t pages, unative_t flags)
{
return (unative_t) ddi_physmem_map(ALIGN_DOWN((uintptr_t) phys_base,
FRAME_SIZE), ALIGN_DOWN((uintptr_t) virt_base, PAGE_SIZE),
(count_t) pages, (int) flags);
}
/** Wrapper for SYS_ENABLE_IOSPACE syscall.
*
* @param uspace_io_arg User space address of DDI argument structure.
*
* @return 0 on success, otherwise it returns error code found in errno.h
*/
unative_t sys_iospace_enable(ddi_ioarg_t *uspace_io_arg)
{
ddi_ioarg_t arg;
int rc;
rc = copy_from_uspace(&arg, uspace_io_arg, sizeof(ddi_ioarg_t));
if (rc != 0)
return (unative_t) rc;
return (unative_t) ddi_iospace_enable((task_id_t) arg.task_id,
(uintptr_t) arg.ioaddr, (size_t) arg.size);
}
/** Disable or enable preemption.
*
* @param enable If non-zero, the preemption counter will be decremented,
* leading to potential enabling of preemption. Otherwise the preemption
* counter will be incremented, preventing preemption from occurring.
*
* @return Zero on success or EPERM if callers capabilities are not sufficient.
*/
unative_t sys_preempt_control(int enable)
{
if (!cap_get(TASK) & CAP_PREEMPT_CONTROL)
return EPERM;
if (enable)
preemption_enable();
else
preemption_disable();
return 0;
}
/** @}
*/

/branches/rcu/kernel/generic/src/ddi/device.c
0,0 → 1,59
/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup genericddi
* @{
*/
/**
* @file
* @brief Device numbers.
*/
#include <arch/types.h>
#include <ddi/device.h>
#include <atomic.h>
#include <debug.h>
static atomic_t last;
/** Assign new device number.
*
* @return Unique device number.
*/
devno_t device_assign_devno(void)
{
devno_t devno;
devno = (devno_t) atomic_postinc(&last);
ASSERT(devno >= 0);
return devno;
}
/** @}
*/