wince源码分析中断之map.c

//------------------------------------------------------------------------------
//
// Function: OALIntrStaticTranslate
//
// This function sets static translation between IRQ and SYSINTR. In most
// cases it should not be used. Only exception is mapping for
// SYSINTR_RTC_ALARM and obsolete device drivers.
//
VOID OALIntrStaticTranslate(UINT32 sysIntr, UINT32 irq)
{
OALMSG(OAL_FUNC&&OAL_INTR, (
L"+OALIntrStaticTranslate(%d, %d)/r/n", sysIntr, irq
));
if (irq < OAL_INTR_IRQ_MAXIMUM && sysIntr < SYSINTR_MAXIMUM) {
g_oalSysIntr2Irq[sysIntr] = irq;
g_oalIrq2SysIntr[irq] = sysIntr;
}
OALMSG(OAL_FUNC&&OAL_INTR, (L"-OALIntrStaticTranslate/r/n"));
}
//------------------------------------------------------------------------------
//
// Function: OALIntrMapInit
//
// This function must be called from OALInterruptInit to initialize mapping
// between IRQ and SYSINTR. It simply initialize mapping arrays.
//
VOID OALIntrMapInit()
{
UINT32 i;

OALMSG(OAL_FUNC&&OAL_INTR, (L"+OALIntrMapInit/r/n"));

// Initialize interrupt maps
for (i = 0; i < SYSINTR_MAXIMUM; i++) {
g_oalSysIntr2Irq[i] = OAL_INTR_IRQ_UNDEFINED;
}
for (i = 0; i < OAL_INTR_IRQ_MAXIMUM; i++) {
g_oalIrq2SysIntr[i] = SYSINTR_UNDEFINED;
}

OALMSG(OAL_FUNC&&OAL_INTR, (L"-OALIntrMapInit/r/n"));
}
wince学习手记

//------------------------------------------------------------------------------
//
// Function: OALIntrTranslateSysIntr
//
// This function maps a SYSINTR to its corresponding IRQ. It is typically used
// in OEMInterruptXXX to obtain IRQs for given SYSINTR.
//
BOOL OALIntrTranslateSysIntr(
UINT32 sysIntr, UINT32 *pCount, const UINT32 **ppIrqs
) {
BOOL rc;

OALMSG(OAL_INTR&&OAL_VERBOSE, (L"+OALTranslateSysIntr(%d)/r/n", sysIntr));

// Valid SYSINTR?
if (sysIntr >= SYSINTR_MAXIMUM) {
rc = FALSE;
goto cleanUp;
}
*pCount = 1;
*ppIrqs = &g_oalSysIntr2Irq[sysIntr];
rc = TRUE;

cleanUp:
OALMSG(OAL_INTR&&OAL_VERBOSE, (L"-OALTranslateSysIntr(rc = %d)/r/n", rc));
return rc;
}

//------------------------------------------------------------------------------
//
// Function: OALIntrTranslateIrq
//
// This function maps a IRQ to its corresponding SYSINTR.
//
UINT32 OALIntrTranslateIrq(UINT32 irq)
{
UINT32 sysIntr = SYSINTR_UNDEFINED;

OALMSG(OAL_FUNC&&OAL_VERBOSE, (L"+OALIntrTranslateIrq(%d)/r/n", irq));

if (irq >= OAL_INTR_IRQ_MAXIMUM) goto cleanUp;
sysIntr = g_oalIrq2SysIntr[irq];

cleanUp:
OALMSG(OAL_FUNC&&OAL_VERBOSE, (
L"-OEMTranslateIrq(sysIntr = %d)/r/n", sysIntr
));
return sysIntr;
}

//------------------------------------------------------------------------------
//
// Function: OALIntrRequestSysIntr
//
// This function allocate new SYSINTR for given IRQ and it there isn't
// static mapping for this IRQ it will create it.
//
UINT32 OALIntrRequestSysIntr(UINT32 count, const UINT32 *pIrqs, UINT32 flags)
{
UINT32 irq, sysIntr;

OALMSG(OAL_INTR&&OAL_FUNC, (
L"+OALIntrRequestSysIntr(%d, 0x%08x, 0x%08x)/r/n", count, pIrqs, flags
));

// Valid IRQ?
if (count != 1 || pIrqs[0] >= OAL_INTR_IRQ_MAXIMUM) {
sysIntr = SYSINTR_UNDEFINED;
goto cleanUp;
}
irq = pIrqs[0];

// If there is mapping for given irq check for special cases
if (g_oalIrq2SysIntr[irq] != SYSINTR_UNDEFINED) {
// If static mapping is requested we fail
if ((flags & OAL_INTR_STATIC) != 0) {
OALMSG(OAL_ERROR, (L"ERROR: OALIntrRequestSysIntr: "
L"Static mapping for IRQ %d already assigned/r/n", irq
));
sysIntr = SYSINTR_UNDEFINED;
goto cleanUp;
}
// If we should translate, return existing SYSINTR
if ((flags & OAL_INTR_TRANSLATE) != 0) {
sysIntr = g_oalIrq2SysIntr[irq];
goto cleanUp;
}
}

// Find next available SYSINTR value...
for (sysIntr = SYSINTR_FIRMWARE; sysIntr < SYSINTR_MAXIMUM; sysIntr++) {
if (g_oalSysIntr2Irq[sysIntr] == OAL_INTR_IRQ_UNDEFINED) break;
}

// Any available SYSINTRs left?
if (sysIntr >= SYSINTR_MAXIMUM) {
OALMSG(OAL_ERROR, (L"ERROR: OALIntrRequestSysIntr: "
L"No avaiable SYSINTR found/r/n"
));
sysIntr = SYSINTR_UNDEFINED;
goto cleanUp;
}

// Make SYSINTR -> IRQ association.
g_oalSysIntr2Irq[sysIntr] = irq;

// Make IRQ -> SYSINTR association if required
if ((flags & OAL_INTR_DYNAMIC) != 0) goto cleanUp;
if (
g_oalIrq2SysIntr[irq] == SYSINTR_UNDEFINED ||
(flags & OAL_INTR_FORCE_STATIC) != 0
) {
g_oalIrq2SysIntr[irq] = sysIntr;
}

cleanUp:
OALMSG(OAL_INTR&&OAL_FUNC, (
L"-OALIntrRequestSysIntr(sysIntr = %d)/r/n", sysIntr
));
return sysIntr;
}

//------------------------------------------------------------------------------
//
// Function: OALIntrReleaseSysIntr
//
// This function release given SYSINTR and remove static mapping if exists.
//
BOOL OALIntrReleaseSysIntr(UINT32 sysIntr)
{
BOOL rc = FALSE;
UINT32 irq;

OALMSG(OAL_INTR&&OAL_FUNC, (L"+OALIntrReleaseSysIntr(%d)/r/n", sysIntr));

// Is the SYSINTR already released?
if (g_oalSysIntr2Irq[sysIntr] == OAL_INTR_IRQ_UNDEFINED) goto cleanUp;

// Remove the SYSINTR -> IRQ mapping
irq = g_oalSysIntr2Irq[sysIntr];
g_oalSysIntr2Irq[sysIntr] = OAL_INTR_IRQ_UNDEFINED;

// If we're releasing the SYSINTR directly mapped in the IRQ mapping,
// remove the IRQ mapping also
if (g_oalIrq2SysIntr[irq] == sysIntr) {
g_oalIrq2SysIntr[irq] = SYSINTR_UNDEFINED;
}

cleanUp:
OALMSG(OAL_INTR&&OAL_FUNC, (L"-OALIntrReleaseSysIntr(rc = %d)/r/n", rc));
return rc;
}

//------------------------------------------------------------------------------

OAL是位于WindowsCE内核与目标设备硬件之间的一个代码层，用于实现windowCE与目标设备硬件之间的通信。为了实现内核与硬件之间最基本的通信功能，OEM必须实现一些必要的功能，同时为了适合不同的硬件配置与操作系统功能，OEM有必要的选择实现一些其他的功能。
在OAL开发过程中，OEM需要实现下列主要功能或函数：
.Startup函数；
.调试串口；
.OEMInit函数；
.系统计时器；
.中断处理；
.内核的输入/输出（ioctl）；
.KITL。
下面给出微软公司提供的各个功能的函数。
/***************************中断处理****************************/
./platform/Common/src/common/intr/base/map.c
The file implement simple table/array based mapping between IRQ and SYSINTR
which is suitable for most OAL implementations.
这个文件主要是用来定义IRQ和SYSIRQ的映射关系。
主要函数如下：
OALIntrMapInit()；//此函数由OALInterruptInit调用来初始化IRQ和SYSIRQ的映射，只是简单的映射数组的初始化；初始化为未定义类型。
VOID OALIntrStaticTranslate(UINT32 sysIntr, UINT32 irq)； //此函数建立IRQ和SYSINTR的静态映射，大多数情况下都不可能用到，只有在SYSINTR_RTC_ALARM和过时的设备驱动的时候会用到。
BOOL OALIntrTranslateSysIntr(UINT32 sysIntr, UINT32 *pCount, const UINT32 **ppIrqs)；//此函数将SYSINTR映射为它相应的IRQ，主要用在OEMInterruptXXX中对于给定SYSINTR得到其IRQs。
UINT32 OALIntrTranslateIrq(UINT32 irq)；//此函数将IRQ映射为相应的SYSINTR。
UINT32 OALIntrRequestSysIntr(UINT32 count, const UINT32 *pIrqs, UINT32 flags)；//此函数为给定的IRQ分配一个新的SYSINTR,如果此IRQ没有静态映射，就创建一个。
BOOL OALIntrReleaseSysIntr(UINT32 sysIntr)；//此函数释放一个SYSINTR，并且消除存在的静态映射。
问题：
SYSINTR于IRQ的映射关系是不是一对一？BOOL OALIntrTranslateSysIntr(UINT32 sysIntr, UINT32 *pCount, const UINT32 **ppIrqs)使用的是地址来进行映射，而UINT32 OALIntrTranslateIrq(UINT32 irq)使用值来进行映射，目前我认为应该是一对一的关系来映射的。
感想：
微软的程序写的很缜密，设计的很合理，能让我学到不少编程的方法。映射关系的编程可以参考微软的中断映射表。

//------------------------------------------------------------------------------

static UINT32 g_oalSysIntr2Irq[SYSINTR_MAXIMUM];
static UINT32 g_oalIrq2SysIntr[OAL_INTR_IRQ_MAXIMUM];

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/gooogleman/archive/2008/10/29/3173431.aspx