| // Post memory manager (PMM) calls |
| // |
| // Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "util.h" // checksum |
| #include "config.h" // BUILD_BIOS_ADDR |
| #include "memmap.h" // e820_list |
| #include "farptr.h" // GET_FARVAR |
| #include "biosvar.h" // EBDA_SEGMENT_MINIMUM |
| |
| |
| /**************************************************************** |
| * malloc |
| ****************************************************************/ |
| |
| #if MODE16 |
| // The 16bit pmm entry points runs in "big real" mode, and can |
| // therefore read/write to the 32bit malloc variables. |
| #define GET_PMMVAR(var) GET_FARVAR(0, (var)) |
| #define SET_PMMVAR(var, val) SET_FARVAR(0, (var), (val)) |
| #else |
| #define GET_PMMVAR(var) (var) |
| #define SET_PMMVAR(var, val) do { (var) = (val); } while (0) |
| #endif |
| |
| // Zone definitions |
| struct zone_s { |
| u32 top, bottom, cur; |
| }; |
| |
| struct zone_s ZoneHigh VAR32VISIBLE, ZoneFSeg VAR32VISIBLE; |
| struct zone_s ZoneTmpLow VAR32VISIBLE, ZoneTmpHigh VAR32VISIBLE; |
| |
| struct zone_s *Zones[] VAR32VISIBLE = { |
| &ZoneTmpLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh |
| }; |
| |
| // Obtain memory from a given zone. |
| static void * |
| zone_malloc(struct zone_s *zone, u32 size, u32 align) |
| { |
| u32 newpos = (GET_PMMVAR(zone->cur) - size) / align * align; |
| if ((s32)(newpos - GET_PMMVAR(zone->bottom)) < 0) |
| // No space |
| return NULL; |
| SET_PMMVAR(zone->cur, newpos); |
| return (void*)newpos; |
| } |
| |
| // Return memory to a zone (if it was the last to be allocated). |
| static void |
| zone_free(struct zone_s *zone, void *data, u32 olddata) |
| { |
| if (! data || GET_PMMVAR(zone->cur) != (u32)data) |
| return; |
| SET_PMMVAR(zone->cur, olddata); |
| } |
| |
| // Find the zone that contains the given data block. |
| static struct zone_s * |
| zone_find(void *data) |
| { |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct zone_s *zone = GET_PMMVAR(Zones[i]); |
| if ((u32)data >= GET_PMMVAR(zone->cur) |
| && (u32)data < GET_PMMVAR(zone->top)) |
| return zone; |
| } |
| return NULL; |
| } |
| |
| // Report the status of all the zones. |
| static void |
| dumpZones() |
| { |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct zone_s *zone = Zones[i]; |
| u32 used = zone->top - zone->cur; |
| u32 avail = zone->top - zone->bottom; |
| u32 pct = avail ? ((100 * used) / avail) : 0; |
| dprintf(2, "zone %d: %08x-%08x used=%d (%d%%)\n" |
| , i, zone->bottom, zone->top, used, pct); |
| } |
| } |
| |
| // Allocate memory at the top of 32bit ram. |
| void * |
| malloc_high(u32 size) |
| { |
| return zone_malloc(&ZoneHigh, size, MALLOC_MIN_ALIGN); |
| } |
| |
| // Allocate memory in the 0xf0000-0x100000 area of ram. |
| void * |
| malloc_fseg(u32 size) |
| { |
| return zone_malloc(&ZoneFSeg, size, MALLOC_MIN_ALIGN); |
| } |
| |
| void |
| malloc_setup() |
| { |
| ASSERT32(); |
| dprintf(3, "malloc setup\n"); |
| |
| // Memory in 0xf0000 area. |
| memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE); |
| ZoneFSeg.bottom = (u32)BiosTableSpace; |
| ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE; |
| |
| // Memory under 1Meg. |
| ZoneTmpLow.bottom = BUILD_STACK_ADDR; |
| ZoneTmpLow.top = ZoneTmpLow.cur = (u32)MAKE_FLATPTR(EBDA_SEGMENT_MINIMUM, 0); |
| |
| // Find memory at the top of ram. |
| u32 top = 0, bottom = 0; |
| int i; |
| for (i=e820_count-1; i>=0; i--) { |
| struct e820entry *e = &e820_list[i]; |
| u64 end = e->start + e->size; |
| if (e->type != E820_RAM || end > 0xffffffff |
| || e->size < CONFIG_MAX_HIGHTABLE + MALLOC_MIN_ALIGN) |
| continue; |
| top = end; |
| bottom = e->start; |
| break; |
| } |
| if (top < 1024*1024 + CONFIG_MAX_HIGHTABLE) { |
| // No memory above 1Meg |
| memset(&ZoneHigh, 0, sizeof(ZoneHigh)); |
| memset(&ZoneTmpHigh, 0, sizeof(ZoneHigh)); |
| return; |
| } |
| |
| // Memory at top of ram. |
| ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN); |
| ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE; |
| add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED); |
| |
| // Memory above 1Meg |
| ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN); |
| ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom; |
| } |
| |
| void |
| malloc_finalize() |
| { |
| dprintf(3, "malloc finalize\n"); |
| |
| dumpZones(); |
| |
| // Give back unused high ram. |
| u32 giveback = (ZoneHigh.cur - ZoneHigh.bottom) / 4096 * 4096; |
| add_e820(ZoneHigh.bottom, giveback, E820_RAM); |
| dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback); |
| |
| // Clear low-memory allocations. |
| memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom); |
| } |
| |
| |
| /**************************************************************** |
| * pmm allocation |
| ****************************************************************/ |
| |
| // Information on PMM tracked allocations |
| struct pmmalloc_s { |
| void *data; |
| u32 olddata; |
| u32 handle; |
| u32 oldallocdata; |
| struct pmmalloc_s *next; |
| }; |
| |
| struct pmmalloc_s *PMMAllocs VAR32VISIBLE; |
| |
| // Memory zone that pmm allocation tracking info is stored in |
| #define ZONEALLOC (&ZoneTmpHigh) |
| |
| // Allocate memory from the given zone and track it as a PMM allocation |
| static void * |
| pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align) |
| { |
| u32 oldallocdata = GET_PMMVAR(ZONEALLOC->cur); |
| struct pmmalloc_s *info = zone_malloc(ZONEALLOC, sizeof(*info) |
| , MALLOC_MIN_ALIGN); |
| if (!info) |
| return NULL; |
| u32 olddata = GET_PMMVAR(zone->cur); |
| void *data = zone_malloc(zone, size, align); |
| if (! data) { |
| zone_free(ZONEALLOC, info, oldallocdata); |
| return NULL; |
| } |
| dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x" |
| " ret=%p (info=%p)\n" |
| , zone, handle, size, align |
| , data, info); |
| SET_PMMVAR(info->data, data); |
| SET_PMMVAR(info->olddata, olddata); |
| SET_PMMVAR(info->handle, handle); |
| SET_PMMVAR(info->oldallocdata, oldallocdata); |
| SET_PMMVAR(info->next, GET_PMMVAR(PMMAllocs)); |
| SET_PMMVAR(PMMAllocs, info); |
| return data; |
| } |
| |
| // Free a raw data block (either from a zone or from pmm alloc list). |
| static void |
| pmm_free_data(struct zone_s *zone, void *data, u32 olddata) |
| { |
| if (GET_PMMVAR(zone->cur) == (u32)data) { |
| zone_free(zone, data, olddata); |
| return; |
| } |
| struct pmmalloc_s *info; |
| for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next)) |
| if (GET_PMMVAR(info->olddata) == (u32)data) { |
| SET_PMMVAR(info->olddata, olddata); |
| return; |
| } else if (GET_PMMVAR(info->oldallocdata) == (u32)data) { |
| SET_PMMVAR(info->oldallocdata, olddata); |
| return; |
| } |
| } |
| |
| // Free a data block allocated with pmm_malloc |
| static int |
| pmm_free(void *data) |
| { |
| struct zone_s *zone = zone_find(GET_PMMVAR(data)); |
| if (!zone) |
| return -1; |
| struct pmmalloc_s **pinfo = &PMMAllocs; |
| for (;;) { |
| struct pmmalloc_s *info = GET_PMMVAR(*pinfo); |
| if (!info) |
| return -1; |
| if (GET_PMMVAR(info->data) == data) { |
| SET_PMMVAR(*pinfo, GET_PMMVAR(info->next)); |
| u32 oldallocdata = GET_PMMVAR(info->oldallocdata); |
| u32 olddata = GET_PMMVAR(info->olddata); |
| pmm_free_data(zone, data, olddata); |
| pmm_free_data(ZONEALLOC, info, oldallocdata); |
| dprintf(8, "pmm_free data=%p zone=%p olddata=%p oldallocdata=%p" |
| " info=%p\n" |
| , data, zone, (void*)olddata, (void*)oldallocdata |
| , info); |
| return 0; |
| } |
| pinfo = &info->next; |
| } |
| } |
| |
| // Find the amount of free space in a given zone. |
| static u32 |
| pmm_getspace(struct zone_s *zone) |
| { |
| u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom); |
| if (zone != ZONEALLOC) |
| return space; |
| u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN); |
| if (space <= reserve) |
| return 0; |
| return space - reserve; |
| } |
| |
| // Find the data block allocated with pmm_malloc with a given handle. |
| static void * |
| pmm_find(u32 handle) |
| { |
| struct pmmalloc_s *info; |
| for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next)) |
| if (GET_PMMVAR(info->handle) == handle) |
| return GET_PMMVAR(info->data); |
| return NULL; |
| } |
| |
| |
| /**************************************************************** |
| * pmm interface |
| ****************************************************************/ |
| |
| struct pmmheader { |
| u32 signature; |
| u8 version; |
| u8 length; |
| u8 checksum; |
| u16 entry_offset; |
| u16 entry_seg; |
| u8 reserved[5]; |
| } PACKED; |
| |
| extern struct pmmheader PMMHEADER; |
| |
| #define PMM_SIGNATURE 0x4d4d5024 // $PMM |
| |
| #if CONFIG_PMM |
| struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = { |
| .version = 0x01, |
| .length = sizeof(PMMHEADER), |
| .entry_seg = SEG_BIOS, |
| }; |
| #endif |
| |
| #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff |
| |
| // PMM - allocate |
| static u32 |
| handle_pmm00(u16 *args) |
| { |
| u32 length = *(u32*)&args[1], handle = *(u32*)&args[3]; |
| u16 flags = args[5]; |
| dprintf(3, "pmm00: length=%x handle=%x flags=%x\n" |
| , length, handle, flags); |
| if (!length) { |
| // Memory size request |
| switch (flags & 3) { |
| default: |
| case 0: |
| return 0; |
| case 1: |
| return pmm_getspace(&ZoneTmpLow); |
| case 2: |
| return pmm_getspace(&ZoneTmpHigh); |
| case 3: { |
| u32 spacelow = pmm_getspace(&ZoneTmpLow); |
| u32 spacehigh = pmm_getspace(&ZoneTmpHigh); |
| if (spacelow > spacehigh) |
| return spacelow; |
| return spacehigh; |
| } |
| } |
| } |
| u32 size = length * 16; |
| if ((s32)size <= 0) |
| return 0; |
| u32 align = MALLOC_MIN_ALIGN; |
| if (flags & 4) { |
| align = 1<<__ffs(size); |
| if (align < MALLOC_MIN_ALIGN) |
| align = MALLOC_MIN_ALIGN; |
| } |
| switch (flags & 3) { |
| default: |
| case 0: |
| return 0; |
| case 1: |
| return (u32)pmm_malloc(&ZoneTmpLow, handle, size, align); |
| case 2: |
| return (u32)pmm_malloc(&ZoneTmpHigh, handle, size, align); |
| case 3: { |
| void *data = pmm_malloc(&ZoneTmpLow, handle, size, align); |
| if (data) |
| return (u32)data; |
| return (u32)pmm_malloc(&ZoneTmpHigh, handle, size, align); |
| } |
| } |
| } |
| |
| // PMM - find |
| static u32 |
| handle_pmm01(u16 *args) |
| { |
| u32 handle = *(u32*)&args[1]; |
| dprintf(3, "pmm01: handle=%x\n", handle); |
| if (handle == 0xFFFFFFFF) |
| return 0; |
| return (u32)pmm_find(handle); |
| } |
| |
| // PMM - deallocate |
| static u32 |
| handle_pmm02(u16 *args) |
| { |
| u32 buffer = *(u32*)&args[1]; |
| dprintf(3, "pmm02: buffer=%x\n", buffer); |
| int ret = pmm_free((void*)buffer); |
| if (ret) |
| // Error |
| return 1; |
| return 0; |
| } |
| |
| static u32 |
| handle_pmmXX(u16 *args) |
| { |
| return PMM_FUNCTION_NOT_SUPPORTED; |
| } |
| |
| u32 VISIBLE16 |
| handle_pmm(u16 *args) |
| { |
| if (! CONFIG_PMM) |
| return PMM_FUNCTION_NOT_SUPPORTED; |
| |
| u16 arg1 = args[0]; |
| dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1); |
| |
| switch (arg1) { |
| case 0x00: return handle_pmm00(args); |
| case 0x01: return handle_pmm01(args); |
| case 0x02: return handle_pmm02(args); |
| default: return handle_pmmXX(args); |
| } |
| } |
| |
| // romlayout.S |
| extern void entry_pmm(); |
| |
| void |
| pmm_setup() |
| { |
| if (! CONFIG_PMM) |
| return; |
| |
| dprintf(3, "init PMM\n"); |
| |
| PMMAllocs = NULL; |
| |
| PMMHEADER.signature = PMM_SIGNATURE; |
| PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR; |
| PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER)); |
| } |
| |
| void |
| pmm_finalize() |
| { |
| if (! CONFIG_PMM) |
| return; |
| |
| dprintf(3, "finalize PMM\n"); |
| |
| PMMHEADER.signature = 0; |
| PMMHEADER.entry_offset = 0; |
| } |