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Make prot_call() able to transparently return via the newly installed copy

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of librm.
This commit is contained in:
Michael Brown
2005-04-10 15:51:10 +00:00
parent 44eee81d11
commit 04a99841e6
2 changed files with 73 additions and 33 deletions
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36
src/arch/i386/transitions/librm_mgmt.c
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@@ -23,7 +23,6 @@
/* Current location of librm in base memory */
char *installed_librm = librm;
static uint32_t installed_librm_phys;
/* Whether or not we have base memory currently allocated for librm.
* Note that we *can* have a working librm present in unallocated base
@@ -67,7 +66,8 @@ void remove_from_rm_stack ( void *data, size_t size ) {
* Install librm to base memory
*
*/
static inline void install_librm ( char *addr ) {
static void install_librm ( char *addr ) {
librm_base = virt_to_phys ( addr );
memcpy ( addr, librm, librm_size );
installed_librm = addr;
}
@@ -79,21 +79,25 @@ static inline void install_librm ( char *addr ) {
* copy.
*
*/
static inline void uninstall_librm ( void ) {
static void uninstall_librm ( void ) {
memcpy ( librm, installed_librm, librm_size );
librm_base = 0;
}
/*
* On entry, record the physical location of librm. Do this so that
* we can update installed_librm after relocation.
*
* Doing this is probably more efficient than making installed_librm
* be a physical address, because of the number of times that
* installed_librm gets referenced in the remainder of the code.
* If librm isn't installed (i.e. if we have librm, but weren't
* entered via it), then install librm and a real-mode stack to a
* fixed temporary location, just so that we can e.g. issue printf()
*
* [ If we were entered via librm, then the real_to_prot call will
* have filled in librm_base. ]
*/
static void librm_init ( void ) {
installed_librm_phys = virt_to_phys ( installed_librm );
if ( ! librm_base ) {
install_librm ( phys_to_virt ( 0x7c00 ) );
inst_rm_stack.segment = 0x7c0;
inst_rm_stack.offset = 0x1000;
}
}
/*
@@ -112,19 +116,17 @@ static void librm_exit ( void ) {
}
/*
* On reset, we want to free up our old installed copy of librm, if
* any, then allocate a new base memory block and install there.
* Reset gets called immediately after relocation.
*
*/
static void librm_reset ( void ) {
char *new_librm;
/* Point installed_librm back at last known physical location */
installed_librm = phys_to_virt ( installed_librm_phys );
/* Uninstall old librm */
uninstall_librm();
/* Point installed_librm back at last known physical location.
* Do this in case we have just relocated and the virtual
* address has therefore changed. */
installed_librm = phys_to_virt ( librm_base );
/* Free allocated base memory, if applicable */
librm_exit();