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Change mailboxes to not use kmalloc

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This commit is contained in:
pjht 2019-09-22 08:38:31 -05:00
parent faf3a3aad9
commit 81fd21da2a
1 changed files with 23 additions and 5 deletions
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28
kernel/cpu/i386/mailboxes.c
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@ -4,6 +4,8 @@
#include <stdint.h>
#include <mailboxes.h>
#include "serial.h"
#include "paging.h"
#include "pmem.h"
#include "../tasking.h"
Mailbox* mailboxes=(Mailbox*)0xF6400000;
@ -37,9 +39,19 @@ void kernel_mailbox_send_msg(Message* user_msg) {
return;
}
Mailbox mailbox=mailboxes[user_msg->to];
char* msg_data=kmalloc(user_msg->size);
memcpy(msg_data,user_msg->msg,user_msg->size);
mailbox.msg_store[mailbox.wr].msg=msg_data;
uint32_t num_pages=(user_msg->size/4096)+1;
void* phys_addr=pmem_alloc(num_pages);
void* virt_addr=find_free_pages(num_pages);
// char* msg_data=kmalloc(user_msg->size);
map_pages(virt_addr,phys_addr,num_pages,0,1);
// if (msg_data==NULL) {
// serial_print("Cannot allocate kernel msg data!\n");
// vga_write_string("Cannot allocate kernel msg data!\n");
// for(;;);
// }
memcpy(virt_addr,user_msg->msg,user_msg->size);
unmap_pages(virt_addr,num_pages);
mailbox.msg_store[mailbox.wr].msg=phys_addr;
mailbox.msg_store[mailbox.wr].from=user_msg->from;
mailbox.msg_store[mailbox.wr].to=user_msg->to;
mailbox.msg_store[mailbox.wr].size=user_msg->size;
@ -73,11 +85,17 @@ void kernel_mailbox_get_msg(uint32_t box, Message* recv_msg, uint32_t buffer_sz)
recv_msg->size=mailbox.msg_store[mailbox.rd].size;
recv_msg->from=0;
serial_printf("Box %s attempted to get the message from box %s, but the buffer was too small.\n",mailboxes[box].name,mailboxes[mailbox.msg_store[mailbox.rd].from].name);
serial_printf("Expected message at most %d big, but got message sized %d.\n",buffer_sz,mailbox.msg_store[mailbox.rd].size);
mailboxes[box]=mailbox;
return;
}
memcpy(recv_msg->msg,mailbox.msg_store[mailbox.rd].msg,mailbox.msg_store[mailbox.rd].size);
kfree(mailbox.msg_store[mailbox.rd].msg);
Message msg=mailbox.msg_store[mailbox.rd];
uint32_t num_pages=(msg.size/4096)+1;
void* virt_addr=find_free_pages(num_pages);
map_pages(virt_addr,msg.msg,num_pages,0,1);
memcpy(recv_msg->msg,virt_addr,mailbox.msg_store[mailbox.rd].size);
unmap_pages(virt_addr,num_pages);
// kfree(mailbox.msg_store[mailbox.rd].msg);
mailbox.msg_store[mailbox.rd].from=0;
uint32_t orig_rd=mailbox.rd;
mailbox.rd++;