pmoninit.htm

mips架构的bootloader,99左右的版本 但源代码现在没人更新了

			<title>PMON Initialization</title>
			<h1 align=center>PMON Initialization</h1>

<!--INDEX "PMON Initialization" -->

Here is a brief description of what happens when PMON
boots (jal is a subroutine call).<p>

Execution starts at 0xbfc00000 (0xa0c00000 on the LR64360). At this 
address there is a jump to _start  (usually at 0xbfc00274).<p>

<!--INDEX cpuInit mips.s cpdata clrbss getHostType -->
<h2>_start: (<a href="../pmon/mips.s">pmon/mips.s</a>)</h2><dl><dd>
  <dl><dt><b>
  jal <a href="../lib/cpuinit.s">cpuInit</a></b><dd>
	This calls getHostType and then sets up the RAM and returns
	a pointer to the correct cache flush routine, and the CPU
	type.<dt><b>
  jalr s0</b><dd>
	Calls the correct flush routine to flush the Dcache. It calls
	indirect via register s0, which was set by cpuInit.  
	<dt><b>
  jal <a href="../lib/cpdata.s">cpdata</a></b><dd>
	Copies the .data section from the PROM to the RAM.<dt><b>
  jal <a href="../lib/clrbss.s">clrbss</a></b><dd>
	Clears the .bss section in RAM.<dt><b>
  jal <a href="../pmon/mips.s">copyHandler</a></b><dd>
	Copies the exception handler to the exception vector in RAM.<dt><b>
  jal <a href="../pmon/mips.s">copyHandler</a></b><dd>
	Copies the exception handler to the exception vector in RAM.<dt><b>
  jalr s0</b><dd>
	Calls the correct flush routine to flush the Dcache. It calls
	indirect via register s0, which was set by cpuInit.  
	<dt><b>
  jalr s0</b><dd>
	Calls the correct flush routine to flush the Icache. It calls
	indirect via register s0, which was set by cpuInit.  
	<dt><b>
  jal <a href="../pmon/main.c">pmoninit</a></b><dd>
	Calls pmoninit, this is the first piece of C. At this point
	   PMON switches to kseg0 addresses (assuming that PMON was linked
	   at a kseg0 address).
	</dl>

<!--INDEX pmoninit hostInit main.c -->
</dl><h2>pmoninit() (<a href="../pmon/main.c">pmon/main.c</a>)</h2><dl><dd>
  <dl><dt><b>
  jal <a href="../lib/cp0supp.s">mfc0</a></b><dd>
	Uses mfc0() to read the Status register (C0_SR).
	This is the first time that RAM is assumed to be working.
	If RAM is not working, control will not return from this
	call.<dt><b>
  jal <a href="../lib/hostinit.c">hostInit(8)</a></b><dd>
	Initialize the DUART. This calls 
	<a href="../lib/termio.c">addDevice</a>, which calls the OP_INIT 
	section of the driver.<dt><b>
  jal <a href="../mon/cli.c">moninit</a></b><dd>
	Initializes the core Monitor.<dt><b>
  jal <a href="../mon/cli.c">addCmdRec</a></b><dd>
	Called several times. Adds PMON-specific commands to the Monitor.
	<dt><b>
  jal <a href="../mon/set.c">addEnvRec</a></b><dd>
	Called several times. Adds PMON-specific environment variables 
	to the Monitor.  <dt><b>
  jal sprintf -- do_cmd</b><dd>
	This pair of functions is called three times. They set two
	environment variables and define the symbol Pmon.
	<dt><b>
  jal <a href="../mon/regs.c">addGpRegs</a> </b><dd>
	Add the Gp registers to the list of registers.
	<dt><b>
  jal <a href="../lib/hostinit.c">hostInit</a> </b><dd>
	Perform additional initialization.
	</dl>
  jal printf </b><dd>
	Print the first part of the banner.
	</dl>

</dl><p><hr>
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