8086: add copy_fork helper

The banking code needs to own this because it owns the mapping sizes and
already needs the same copiers to move pages around.

diff --git a/Kernel/bank8086.c b/Kernel/bank8086.c
index 59cb627..bfc153c 100644 (file)
--- a/Kernel/bank8086.c
+++ b/Kernel/bank8086.c
@@ -216,7 +216,7 @@ static int do_process_create(uint8_t csize, uint8_t dsize, uint8_t ssize)
 #endif 
        m->cbase = alloc_code(csize);
        if (m->cbase == 0) {
-#ifdef COFNIG_IBMPC_EMM        
+#ifdef COFNIG_IBMPC_EMM
                emm_free_bank(m);
 #endif         
                return -1;
@@ -299,7 +299,7 @@ static int stack_fault(uint8_t ssize)
        /* Collided ? if so we will wrap */
        if (m->ssize + m->dsize > m->ssize)
                return ENOMEM;
-#ifdef CONFIG_IBMPC_EMM                
+#ifdef CONFIG_IBMPC_EMM
        if (m->emm) {
                m->ssize = ssize;
                return 0;
@@ -443,6 +443,26 @@ void pagemap_free(ptptr p)
        claim_regions(m, 0);
 }
 
+void fork_copy(ptptr p)
+{
+       struct proc_map *parent_m = (struct proc_map *)udata.u_page2;
+       struct proc_map *child_m = (struct proc_map *)p->p_page2;
+       /* udata is the parent ptptr p is the child */
+#ifdef CONFIG_IBMPC_EMM
+       if (emm) {
+               /* This one is hard as both might be EMM so we'll need to do
+                  a pair of 32K/32K mappings to copy them over */
+               emm_copy_data_pages(parent_m, child_m);
+       }
+       else
+#endif
+       copy_pages(child->m_dbase, parent->m_dbase, parent->m_dsize);
+       /* This last one will need to be reworked once we've got shared
+          code segments */
+       copy_pages(child->m_cbase, parent->m_cbase, parent->m_csize);
+}
+
+
 #ifdef CONFIG_SWAP
 
 int swapout(ptptr p)