static int
test_kalloc(void)
{
test_start("kalloc");
/* Test that malloc works and the process server can allocate from static heap properly. */
for (int repeats = 0; repeats < 100; repeats++) {
int *a = kmalloc(sizeof(int) * 10240);
assert(a);
for (int i = 0; i < 10240; i++) a[i] = i;
for (int i = 0; i < 10240; i++) test_assert(a[i] == i);
kfree(a);
}
/* Test that kernel obj allocation works and that the VKA allocator has been
bootstrapped properly. */
vka_object_t obj[100];
int error = -1;
for (int repeats = 0; repeats < 100; repeats++) {
for (int i = 0; i < 100; i++) {
error = vka_alloc_endpoint(&procServ.vka, &obj[i]);
test_assert(!error);
test_assert(obj[i].cptr != 0);
}
for (int i = 0; i < 100; i++) {
vka_free_object(&procServ.vka, &obj[i]);
}
for (int i = 0; i < 100; i++) {
error = vka_alloc_frame(&procServ.vka, seL4_PageBits, &obj[i]);
test_assert(!error);
test_assert(obj[i].cptr != 0);
}
for (int i = 0; i < 100; i++) {
vka_free_object(&procServ.vka, &obj[i]);
}
}
return test_success();
}
static int
new_pages_at_vaddr(vspace_t *vspace, void *vaddr, size_t num_pages, size_t size_bits,
seL4_CapRights rights, int cacheable)
{
sel4utils_alloc_data_t *data = get_alloc_data(vspace);
int i;
int error = seL4_NoError;
void *start_vaddr = vaddr;
for (i = 0; i < num_pages; i++) {
vka_object_t object;
if (vka_alloc_frame(data->vka, size_bits, &object) != 0) {
/* abort! */
ZF_LOGE("Failed to allocate page");
error = seL4_NotEnoughMemory;
break;
}
error = map_page(vspace, object.cptr, vaddr, rights, cacheable, size_bits);
if (error == seL4_NoError) {
error = update_entries(vspace, (uintptr_t) vaddr, object.cptr, size_bits, object.ut);
vaddr = (void *) ((uintptr_t) vaddr + (1 << size_bits));
} else {
vka_free_object(data->vka, &object);
break;
}
}
if (i < num_pages) {
/* we failed, clean up successfully allocated pages */
sel4utils_unmap_pages(vspace, start_vaddr, i, size_bits, data->vka);
}
return error;
}
int main(void)
{
UNUSED int error;
/* Set up logging and give us a name: useful for debugging if the thread faults */
zf_log_set_tag_prefix("hello-3:");
name_thread(seL4_CapInitThreadTCB, "hello-3");
/* get boot info */
info = seL4_GetBootInfo();
/* init simple */
simple_default_init_bootinfo(&simple, info);
/* print out bootinfo and other info about simple */
simple_print(&simple);
/* create an allocator */
allocman = bootstrap_use_current_simple(&simple, ALLOCATOR_STATIC_POOL_SIZE, allocator_mem_pool);
ZF_LOGF_IF(allocman == NULL, "Failed to initialize alloc manager.\n"
"\tMemory pool sufficiently sized?\n"
"\tMemory pool pointer valid?\n");
/* create a vka (interface for interacting with the underlying allocator) */
allocman_make_vka(&vka, allocman);
/* get our cspace root cnode */
seL4_CPtr cspace_cap;
cspace_cap = simple_get_cnode(&simple);
/* get our vspace root page directory */
seL4_CPtr pd_cap;
pd_cap = simple_get_pd(&simple);
/* create a new TCB */
vka_object_t tcb_object = {0};
error = vka_alloc_tcb(&vka, &tcb_object);
ZF_LOGF_IFERR(error, "Failed to allocate new TCB.\n"
"\tVKA given sufficient bootstrap memory?");
/*
* create and map an ipc buffer:
*/
/* TODO 1: get a frame cap for the ipc buffer */
/* hint: vka_alloc_frame()
* int vka_alloc_frame(vka_t *vka, uint32_t size_bits, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param size_bits Frame size: 2^size_bits
* @param result Structure for the Frame object. This gets initialised.
* @return 0 on success
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_1:
*/
vka_object_t ipc_frame_object;
error = vka_alloc_frame(&vka, IPCBUF_FRAME_SIZE_BITS, &ipc_frame_object);
ZF_LOGF_IFERR(error, "Failed to alloc a frame for the IPC buffer.\n"
"\tThe frame size is not the number of bytes, but an exponent.\n"
"\tNB: This frame is not an immediately usable, virtually mapped page.\n")
/*
* map the frame into the vspace at ipc_buffer_vaddr.
* To do this we first try to map it in to the root page directory.
* If there is already a page table mapped in the appropriate slot in the
* page diretory where we can insert this frame, then this will succeed.
* Otherwise we first need to create a page table, and map it in to
* the page directory, before we can map the frame in. */
seL4_Word ipc_buffer_vaddr = IPCBUF_VADDR;
/* TODO 2: try to map the frame the first time */
/* hint 1: seL4_ARCH_Page_Map()
* The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils
* this one is defined as:
* #define seL4_ARCH_Page_Map seL4_X86_Page_Map
* in: Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_2:
* The signature for the underlying function is:
* int seL4_X86_Page_Map(seL4_X86_Page service, seL4_X86_PageDirectory pd, seL4_Word vaddr, seL4_CapRights rights, seL4_X86_VMAttributes attr)
* @param service Capability to the page to map.
* @param pd Capability to the VSpace which will contain the mapping.
* @param vaddr Virtual address to map the page into.
* @param rights Rights for the mapping.
* @param attr VM Attributes for the mapping.
* @return 0 on success.
*
* Note: this function is generated during build. It is generated from the following definition:
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_2:
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*
* hint 2: for the rights, use seL4_AllRights
* hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes
* Hint 4: It is normal for this function call to fail. That means there are
* no page tables with free slots -- proceed to the next step where you'll
* be led to allocate a new empty page table and map it into the VSpace,
* before trying again.
*/
error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr,
seL4_AllRights, seL4_ARCH_Default_VMAttributes);
if (error != 0) {
/* TODO 3: create a page table */
/* hint: vka_alloc_page_table()
* int vka_alloc_page_table(vka_t *vka, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param result Structure for the PageTable object. This gets initialised.
* @return 0 on success
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_3:
*/
vka_object_t pt_object;
error = vka_alloc_page_table(&vka, &pt_object);
ZF_LOGF_IFERR(error, "Failed to allocate new page table.\n");
/* TODO 4: map the page table */
/* hint 1: seL4_ARCH_PageTable_Map()
* The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils
* this one is defined as:
* #define seL4_ARCH_PageTable_Map seL4_X86_PageTable_Map
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_4:
* The signature for the underlying function is:
* int seL4_X86_PageTable_Map(seL4_X86_PageTable service, seL4_X86_PageDirectory pd, seL4_Word vaddr, seL4_X86_VMAttributes attr)
* @param service Capability to the page table to map.
* @param pd Capability to the VSpace which will contain the mapping.
* @param vaddr Virtual address to map the page table into.
* @param rights Rights for the mapping.
* @param attr VM Attributes for the mapping.
* @return 0 on success.
*
* Note: this function is generated during build. It is generated from the following definition:
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_4:
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*
* hint 2: for VM attributes use seL4_ARCH_Default_VMAttributes
*/
error = seL4_ARCH_PageTable_Map(pt_object.cptr, pd_cap,
ipc_buffer_vaddr, seL4_ARCH_Default_VMAttributes);
ZF_LOGF_IFERR(error, "Failed to map page table into VSpace.\n"
"\tWe are inserting a new page table into the top-level table.\n"
"\tPass a capability to the new page table, and not for example, the IPC buffer frame vaddr.\n")
/* TODO 5: then map the frame in */
/* hint 1: use seL4_ARCH_Page_Map() as above
* hint 2: for the rights, use seL4_AllRights
* hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes
*/
error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap,
ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes);
ZF_LOGF_IFERR(error, "Failed again to map the IPC buffer frame into the VSpace.\n"
"\t(It's not supposed to fail.)\n"
"\tPass a capability to the IPC buffer's physical frame.\n"
"\tRevisit the first seL4_ARCH_Page_Map call above and double-check your arguments.\n");
}
/* set the IPC buffer's virtual address in a field of the IPC buffer */
seL4_IPCBuffer *ipcbuf = (seL4_IPCBuffer*)ipc_buffer_vaddr;
ipcbuf->userData = ipc_buffer_vaddr;
/* TODO 6: create an endpoint */
/* hint: vka_alloc_endpoint()
* int vka_alloc_endpoint(vka_t *vka, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param result Structure for the Endpoint object. This gets initialised.
* @return 0 on success
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_6:
*/
error = vka_alloc_endpoint(&vka, &ep_object);
ZF_LOGF_IFERR(error, "Failed to allocate new endpoint object.\n");
/* TODO 7: make a badged copy of it in our cspace. This copy will be used to send
* an IPC message to the original cap */
/* hint 1: vka_mint_object()
* int vka_mint_object(vka_t *vka, vka_object_t *object, cspacepath_t *result, seL4_CapRights rights, seL4_CapData_t badge)
* @param[in] vka The allocator for the cspace.
* @param[in] object Target object for cap minting.
* @param[out] result Allocated cspacepath.
* @param[in] rights The rights for the minted cap.
* @param[in] badge The badge for the minted cap.
* @return 0 on success
*
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_7:
*
* hint 2: for the rights, use seL4_AllRights
* hint 3: for the badge use seL4_CapData_Badge_new()
* seL4_CapData_t CONST seL4_CapData_Badge_new(seL4_Uint32 Badge)
* @param[in] Badge The badge number to use
* @return A CapData structure containing the desired badge info
*
* seL4_CapData_t is generated during build.
* The type definition and generated field access functions are defined in a generated file:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_7:
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*
* hint 4: for the badge use EP_BADGE
*/
error = vka_mint_object(&vka, &ep_object, &ep_cap_path, seL4_AllRights,
seL4_CapData_Badge_new(EP_BADGE));
ZF_LOGF_IFERR(error, "Failed to mint new badged copy of IPC endpoint.\n"
"\tseL4_Mint is the backend for vka_mint_object.\n"
"\tseL4_Mint is simply being used here to create a badged copy of the same IPC endpoint.\n"
"\tThink of a badge in this case as an IPC context cookie.\n");
/* initialise the new TCB */
error = seL4_TCB_Configure(tcb_object.cptr, seL4_CapNull, seL4_PrioProps_new(seL4_MaxPrio, seL4_MaxPrio),
cspace_cap, seL4_NilData, pd_cap, seL4_NilData,
ipc_buffer_vaddr, ipc_frame_object.cptr);
ZF_LOGF_IFERR(error, "Failed to configure the new TCB object.\n"
"\tWe're running the new thread with the root thread's CSpace.\n"
"\tWe're running the new thread in the root thread's VSpace.\n");
/* give the new thread a name */
name_thread(tcb_object.cptr, "hello-3: thread_2");
/* set start up registers for the new thread */
seL4_UserContext regs = {0};
size_t regs_size = sizeof(seL4_UserContext) / sizeof(seL4_Word);
/* set instruction pointer where the thread shoud start running */
sel4utils_set_instruction_pointer(®s, (seL4_Word)thread_2);
/* check that stack is aligned correctly */
const int stack_alignment_requirement = sizeof(seL4_Word) * 2;
uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack);
ZF_LOGF_IF(thread_2_stack_top % (stack_alignment_requirement) != 0,
"Stack top isn't aligned correctly to a %dB boundary.\n"
"\tDouble check to ensure you're not trampling.",
stack_alignment_requirement);
/* set stack pointer for the new thread. remember the stack grows down */
sel4utils_set_stack_pointer(®s, thread_2_stack_top);
/* set the fs register for IPC buffer */
regs.fs = IPCBUF_GDT_SELECTOR;
/* actually write the TCB registers. */
error = seL4_TCB_WriteRegisters(tcb_object.cptr, 0, 0, regs_size, ®s);
ZF_LOGF_IFERR(error, "Failed to write the new thread's register set.\n"
"\tDid you write the correct number of registers? See arg4.\n");
/* start the new thread running */
error = seL4_TCB_Resume(tcb_object.cptr);
ZF_LOGF_IFERR(error, "Failed to start new thread.\n");
/* we are done, say hello */
printf("main: hello world\n");
/*
* now send a message to the new thread, and wait for a reply
*/
seL4_Word msg;
seL4_MessageInfo_t tag;
/* TODO 8: set the data to send. We send it in the first message register */
/* hint 1: seL4_MessageInfo_new()
* seL4_MessageInfo_t CONST seL4_MessageInfo_new(seL4_Uint32 label, seL4_Uint32 capsUnwrapped, seL4_Uint32 extraCaps, seL4_Uint32 length)
* @param label The value of the label field
* @param capsUnwrapped The value of the capsUnwrapped field
* @param extraCaps The value of the extraCaps field
* @param length The number of message registers to send
* @return The seL4_MessageInfo_t containing the given values.
*
* seL4_MessageInfo_new() is generated during build. It can be found in:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_8:
*
* hint 2: use 0 for the first 3 fields.
* hint 3: send only 1 message register of data
*
* hint 4: seL4_SetMR()
* void seL4_SetMR(int i, seL4_Word mr)
* @param i The message register to write
* @param mr The value of the message register
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_8:
* You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*
* hint 5: send MSG_DATA
*/
tag = seL4_MessageInfo_new(0, 0, 0, 1);
seL4_SetMR(0, MSG_DATA);
/* TODO 9: send and wait for a reply. */
/* hint: seL4_Call()
* seL4_MessageInfo_t seL4_Call(seL4_CPtr dest, seL4_MessageInfo_t msgInfo)
* @param dest The capability to be invoked.
* @param msgInfo The messageinfo structure for the IPC. This specifies information about the message to send (such as the number of message registers to send).
* @return A seL4_MessageInfo_t structure. This is information about the repy message.
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_9:
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*
* hint 2: seL4_MessageInfo_t is generated during build.
* The type definition and generated field access functions are defined in a generated file:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_9:
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*/
tag = seL4_Call(ep_cap_path.capPtr, tag);
/* TODO 10: get the reply message */
/* hint: seL4_GetMR()
* seL4_Word seL4_GetMR(int i)
* @param i The message register to retreive
* @return The message register value
* Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_10:
* You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf
*/
msg = seL4_GetMR(0);
/* check that we got the expected repy */
ZF_LOGF_IF(seL4_MessageInfo_get_length(tag) != 1,
"Response data from thread_2 was not the length expected.\n"
"\tHow many registers did you set with seL4_SetMR within thread_2?\n");
ZF_LOGF_IF(msg != ~MSG_DATA,
"Response data from thread_2's content was not what was expected.\n");
printf("main: got a reply: %#x\n", msg);
return 0;
}
int
vm_copyout_atags(vm_t* vm, struct atag_list* atags, uint32_t addr)
{
vspace_t *vm_vspace, *vmm_vspace;
void* vm_addr, *vmm_addr, *buf;
reservation_t res;
vka_t* vka;
vka_object_t frame;
size_t size;
struct atag_list* atag_cur;
int err;
vka = vm->vka;
vm_addr = (void*)(addr & ~0xfff);
vm_vspace = vm_get_vspace(vm);
vmm_vspace = vm->vmm_vspace;
/* Make sure we don't cross a page boundary
* NOTE: the next page will usually be used by linux for PT!
*/
for (size = 0, atag_cur = atags; atag_cur != NULL; atag_cur = atag_cur->next) {
size += atags_size_bytes(atag_cur);
}
size += 8; /* NULL tag */
assert((addr & 0xfff) + size < 0x1000);
/* Create a frame (and a copy for the VMM) */
err = vka_alloc_frame(vka, 12, &frame);
assert(!err);
if (err) {
return -1;
}
/* Map the frame to the VMM */
vmm_addr = vspace_map_pages(vmm_vspace, &frame.cptr, NULL, seL4_AllRights, 1, 12, 0);
assert(vmm_addr);
/* Copy in the atags */
buf = vmm_addr + (addr & 0xfff);
for (atag_cur = atags; atag_cur != NULL; atag_cur = atag_cur->next) {
int tag_size = atags_size_bytes(atag_cur);
DVM("ATAG copy 0x%x<-0x%x %d\n", (uint32_t)buf, (uint32_t)atag_cur->hdr, tag_size);
memcpy(buf, atag_cur->hdr, tag_size);
buf += tag_size;
}
/* NULL tag terminator */
memset(buf, 0, 8);
/* Unmap the page and map it into the VM */
vspace_unmap_pages(vmm_vspace, vmm_addr, 1, 12, NULL);
res = vspace_reserve_range_at(vm_vspace, vm_addr, 0x1000, seL4_AllRights, 0);
assert(res.res);
if (!res.res) {
vka_free_object(vka, &frame);
return -1;
}
err = vspace_map_pages_at_vaddr(vm_vspace, &frame.cptr, NULL, vm_addr, 1, 12, res);
vspace_free_reservation(vm_vspace, res);
assert(!err);
if (err) {
printf("Failed to provide memory\n");
vka_free_object(vka, &frame);
return -1;
}
return 0;
}
int main(void)
{
UNUSED int error;
/* give us a name: useful for debugging if the thread faults */
name_thread(seL4_CapInitThreadTCB, "hello-3");
/* get boot info */
info = seL4_GetBootInfo();
/* init simple */
simple_default_init_bootinfo(&simple, info);
/* print out bootinfo and other info about simple */
simple_print(&simple);
/* create an allocator */
allocman = bootstrap_use_current_simple(&simple, ALLOCATOR_STATIC_POOL_SIZE, allocator_mem_pool);
assert(allocman);
/* create a vka (interface for interacting with the underlying allocator) */
allocman_make_vka(&vka, allocman);
/* get our cspace root cnode */
seL4_CPtr cspace_cap;
cspace_cap = simple_get_cnode(&simple);
/* get our vspace root page directory */
seL4_CPtr pd_cap;
pd_cap = simple_get_pd(&simple);
/* create a new TCB */
vka_object_t tcb_object = {0};
error = vka_alloc_tcb(&vka, &tcb_object);
assert(error == 0);
/*
* create and map an ipc buffer:
*/
/* TODO 1: get a frame cap for the ipc buffer */
/* hint: vka_alloc_frame()
* int vka_alloc_frame(vka_t *vka, uint32_t size_bits, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param size_bits Frame size: 2^size_bits
* @param result Structure for the Frame object. This gets initialised.
* @return 0 on success
* https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L147
*/
vka_object_t ipc_frame_object;
error = vka_alloc_frame(&vka, IPCBUF_FRAME_SIZE_BITS, &ipc_frame_object);
assert(error == 0);
/*
* map the frame into the vspace at ipc_buffer_vaddr.
* To do this we first try to map it in to the root page directory.
* If there is already a page table mapped in the appropriate slot in the
* page diretory where we can insert this frame, then this will succeed.
* Otherwise we first need to create a page table, and map it in to
* the page directory, before we can map the frame in. */
seL4_Word ipc_buffer_vaddr = IPCBUF_VADDR;
/* TODO 2: try to map the frame the first time */
/* hint 1: seL4_ARCH_Page_Map()
* The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils
* this one is defined as:
* #define seL4_ARCH_Page_Map seL4_IA32_Page_Map
* in: https://github.com/seL4/libsel4utils/blob/master/include/sel4utils/mapping.h#L69
* The signature for the underlying function is:
* int seL4_IA32_Page_Map(seL4_IA32_Page service, seL4_IA32_PageDirectory pd, seL4_Word vaddr, seL4_CapRights rights, seL4_IA32_VMAttributes attr)
* @param service Capability to the page to map.
* @param pd Capability to the VSpace which will contain the mapping.
* @param vaddr Virtual address to map the page into.
* @param rights Rights for the mapping.
* @param attr VM Attributes for the mapping.
* @return 0 on success.
*
* Note: this function is generated during build. It is generated from the following definition:
* https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/interfaces/sel4arch.xml#L52
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*
* hint 2: for the rights, use seL4_AllRights
* hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes
*/
error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr,
seL4_AllRights, seL4_ARCH_Default_VMAttributes);
if (error != 0) {
/* TODO 3: create a page table */
/* hint: vka_alloc_page_table()
* int vka_alloc_page_table(vka_t *vka, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param result Structure for the PageTable object. This gets initialised.
* @return 0 on success
* https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L178
*/
vka_object_t pt_object;
error = vka_alloc_page_table(&vka, &pt_object);
assert(error == 0);
/* TODO 4: map the page table */
/* hint 1: seL4_ARCH_PageTable_Map()
* The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils
* this one is defined as:
* #define seL4_ARCH_PageTable_Map seL4_IA32_PageTable_Map
* in: https://github.com/seL4/libsel4utils/blob/master/include/sel4utils/mapping.h#L73
* The signature for the underlying function is:
* int seL4_IA32_PageTable_Map(seL4_IA32_PageTable service, seL4_IA32_PageDirectory pd, seL4_Word vaddr, seL4_IA32_VMAttributes attr)
* @param service Capability to the page table to map.
* @param pd Capability to the VSpace which will contain the mapping.
* @param vaddr Virtual address to map the page table into.
* @param rights Rights for the mapping.
* @param attr VM Attributes for the mapping.
* @return 0 on success.
*
* Note: this function is generated during build. It is generated from the following definition:
* https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/interfaces/sel4arch.xml#L37
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*
* hint 2: for VM attributes use seL4_ARCH_Default_VMAttributes
*/
error = seL4_ARCH_PageTable_Map(pt_object.cptr, pd_cap,
ipc_buffer_vaddr, seL4_ARCH_Default_VMAttributes);
assert(error == 0);
/* TODO 5: then map the frame in */
/* hint 1: use seL4_ARCH_Page_Map() as above
* hint 2: for the rights, use seL4_AllRights
* hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes
*/
error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap,
ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes);
assert(error == 0);
}
/* set the IPC buffer's virtual address in a field of the IPC buffer */
seL4_IPCBuffer *ipcbuf = (seL4_IPCBuffer*)ipc_buffer_vaddr;
ipcbuf->userData = ipc_buffer_vaddr;
/* TODO 6: create an endpoint */
/* hint: vka_alloc_endpoint()
* int vka_alloc_endpoint(vka_t *vka, vka_object_t *result)
* @param vka Pointer to vka interface.
* @param result Structure for the Endpoint object. This gets initialised.
* @return 0 on success
* https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L94
*/
error = vka_alloc_endpoint(&vka, &ep_object);
assert(error == 0);
/* TODO 7: make a badged copy of it in our cspace. This copy will be used to send
* an IPC message to the original cap */
/* hint 1: vka_mint_object()
* int vka_mint_object(vka_t *vka, vka_object_t *object, cspacepath_t *result, seL4_CapRights rights, seL4_CapData_t badge)
* @param[in] vka The allocator for the cspace.
* @param[in] object Target object for cap minting.
* @param[out] result Allocated cspacepath.
* @param[in] rights The rights for the minted cap.
* @param[in] badge The badge for the minted cap.
* @return 0 on success
*
* https://github.com/seL4/libsel4vka/blob/master/include/vka/object_capops.h#L41
*
* hint 2: for the rights, use seL4_AllRights
* hint 3: for the badge use seL4_CapData_Badge_new()
* seL4_CapData_t CONST seL4_CapData_Badge_new(seL4_Uint32 Badge)
* @param[in] Badge The badge number to use
* @return A CapData structure containing the desired badge info
*
* seL4_CapData_t is generated during build.
* The type definition and generated field access functions are defined in a generated file:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L30
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*
* hint 4: for the badge use EP_BADGE
*/
error = vka_mint_object(&vka, &ep_object, &ep_cap_path, seL4_AllRights,
seL4_CapData_Badge_new(EP_BADGE));
assert(error == 0);
/* initialise the new TCB */
error = seL4_TCB_Configure(tcb_object.cptr, seL4_CapNull, seL4_MaxPrio,
cspace_cap, seL4_NilData, pd_cap, seL4_NilData,
ipc_buffer_vaddr, ipc_frame_object.cptr);
assert(error == 0);
/* give the new thread a name */
name_thread(tcb_object.cptr, "hello-3: thread_2");
/* set start up registers for the new thread */
seL4_UserContext regs = {0};
size_t regs_size = sizeof(seL4_UserContext) / sizeof(seL4_Word);
/* set instruction pointer where the thread shoud start running */
sel4utils_set_instruction_pointer(®s, (seL4_Word)thread_2);
/* check that stack is aligned correctly */
uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack);
assert(thread_2_stack_top % (sizeof(seL4_Word) * 2) == 0);
/* set stack pointer for the new thread. remember the stack grows down */
sel4utils_set_stack_pointer(®s, thread_2_stack_top);
/* set the gs register for thread local storage */
regs.gs = IPCBUF_GDT_SELECTOR;
/* actually write the TCB registers. */
error = seL4_TCB_WriteRegisters(tcb_object.cptr, 0, 0, regs_size, ®s);
assert(error == 0);
/* start the new thread running */
error = seL4_TCB_Resume(tcb_object.cptr);
assert(error == 0);
/* we are done, say hello */
printf("main: hello world\n");
/*
* now send a message to the new thread, and wait for a reply
*/
seL4_Word msg;
seL4_MessageInfo_t tag;
/* TODO 8: set the data to send. We send it in the first message register */
/* hint 1: seL4_MessageInfo_new()
* seL4_MessageInfo_t CONST seL4_MessageInfo_new(seL4_Uint32 label, seL4_Uint32 capsUnwrapped, seL4_Uint32 extraCaps, seL4_Uint32 length)
* @param label The value of the label field
* @param capsUnwrapped The value of the capsUnwrapped field
* @param extraCaps The value of the extraCaps field
* @param length The number of message registers to send
* @return The seL4_MessageInfo_t containing the given values.
*
* seL4_MessageInfo_new() is generated during build. It can be found in:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L35
*
* hint 2: use 0 for the first 3 fields.
* hint 3: send only 1 message register of data
*
* hint 4: seL4_SetMR()
* void seL4_SetMR(int i, seL4_Word mr)
* @param i The message register to write
* @param mr The value of the message register
* https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/functions.h#L41
* You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*
* hint 5: send MSG_DATA
*/
tag = seL4_MessageInfo_new(0, 0, 0, 1);
seL4_SetMR(0, MSG_DATA);
/* TODO 9: send and wait for a reply. */
/* hint: seL4_Call()
* seL4_MessageInfo_t seL4_Call(seL4_CPtr dest, seL4_MessageInfo_t msgInfo)
* @param dest The capability to be invoked.
* @param msgInfo The messageinfo structure for the IPC. This specifies information about the message to send (such as the number of message registers to send).
* @return A seL4_MessageInfo_t structure. This is information about the repy message.
* https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/syscalls.h#L242
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*
* hint 2: seL4_MessageInfo_t is generated during build.
* The type definition and generated field access functions are defined in a generated file:
* build/x86/pc99/libsel4/include/sel4/types_gen.h
* It is generated from the following definition:
* https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L35
* You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*/
tag = seL4_Call(ep_cap_path.capPtr, tag);
/* TODO 10: get the reply message */
/* hint: seL4_GetMR()
* seL4_Word seL4_GetMR(int i)
* @param i The message register to retreive
* @return The message register value
* https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/functions.h#L33
* You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf
*/
msg = seL4_GetMR(0);
/* check that we got the expected repy */
assert(seL4_MessageInfo_get_length(tag) == 1);
assert(msg == ~MSG_DATA);
printf("main: got a reply: %#x\n", msg);
return 0;
}
int
test_vspace_mapping(void)
{
test_start("vspace mapping");
/* Create a vspace for testing mapping. */
struct vs_vspace vs;
int error = vs_initialise(&vs, 31337);
test_assert(error == ESUCCESS);
test_assert(vs.magic == REFOS_VSPACE_MAGIC);
/* Create a memory segment window. */
const vaddr_t window = 0x10000;
const vaddr_t windowSize = 0x8000;
int windowID;
error = vs_create_window(&vs, window, windowSize, W_PERMISSION_WRITE | W_PERMISSION_READ,
true, &windowID);
test_assert(error == ESUCCESS);
test_assert(windowID != W_INVALID_WINID);
/* Allocate a frame to map. */
vka_object_t frame;
error = vka_alloc_frame(&procServ.vka, seL4_PageBits, &frame);
test_assert(error == ESUCCESS);
test_assert(frame.cptr != 0);
/* Try to map in some invalid spots. */
tvprintf("trying mapping into invalid spots...\n");
error = vs_map(&vs, 0x9A0, &frame.cptr, 1);
test_assert(error == EINVALIDWINDOW);
error = vs_map(&vs, window - 0x9A0, &frame.cptr, 1);
test_assert(error == EINVALIDWINDOW);
error = vs_map(&vs, window + windowSize + 0x1, &frame.cptr, 1);
test_assert(error == EINVALIDWINDOW);
error = vs_map(&vs, window + windowSize + 0x5123, &frame.cptr, 1);
test_assert(error == EINVALIDWINDOW);
/* Try to unmap from some invalid spots. */
tvprintf("trying unmapping from invalid spots...\n");
error = vs_unmap(&vs, window - 0x9A0, 1);
test_assert(error == EINVALIDWINDOW);
error = vs_unmap(&vs, window + windowSize + 0x423, 5);
test_assert(error == EINVALIDWINDOW);
error = vs_unmap(&vs, window, windowSize + 1);
test_assert(error == EINVALIDWINDOW);
/* Map the frame many times in all the valid spots. */
for (vaddr_t waddr = window; waddr < window + windowSize; waddr += (1 << seL4_PageBits)) {
tvprintf("trying mapping into valid spot 0x%x...\n", (uint32_t) waddr);
/* Map the frame. */
error = vs_map(&vs, waddr, &frame.cptr, 1);
test_assert(error == ESUCCESS);
/* Try to map frame here again. Should complain. */
error = vs_map(&vs, waddr, &frame.cptr, 1);
test_assert(error == EUNMAPFIRST);
}
/* Unmap and remap the frame many times in all the valid spots. */
for (vaddr_t waddr = window; waddr < window + windowSize; waddr += (1 << seL4_PageBits)) {
tvprintf("trying remapping into valid spot 0x%x...\n", (uint32_t) waddr);
/* Unmap the frame. */
error = vs_unmap(&vs, waddr, 1);
test_assert(error == ESUCCESS);
/* Remap the frame. */
error = vs_map(&vs, waddr, &frame.cptr, 1);
test_assert(error == ESUCCESS);
}
/* Clean up. Note that deleting the vspace should delete the created window. */
tvprintf("cleaning up everything in vspace...\n");
vs_unref(&vs);
test_assert(vs.magic != REFOS_VSPACE_MAGIC);
vka_free_object(&procServ.vka, &frame);
return test_success();
}